Magnetic Fields - MCAT Physical
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Which of the following best describes magnetic field lines?
Which of the following best describes magnetic field lines?
First, magnetic field lines, like electric field lines, can never cross. Also, unlike electric field lines, magnetic field lines are continuous—they do not have starting or ending points. Next, the force experienced by a charge in a magnetic field depends on the charge's velocity direction, not just the magnetic field. So the only remaining choice is that magnetic field lines show both the relative strength and direction of the field.
First, magnetic field lines, like electric field lines, can never cross. Also, unlike electric field lines, magnetic field lines are continuous—they do not have starting or ending points. Next, the force experienced by a charge in a magnetic field depends on the charge's velocity direction, not just the magnetic field. So the only remaining choice is that magnetic field lines show both the relative strength and direction of the field.
Compare your answer with the correct one above
Which of the following influences the emf produced in a wire loop that is rotating in a magnetic field?
Which of the following influences the emf produced in a wire loop that is rotating in a magnetic field?
Recall that 
, where 
. The shape, material characteristics, and resistance do not appear in this equation. So only the size (area) of the loop influences the emf.
Recall that
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A scientist builds a particle accelerator. Which of the following would not help the scientist increase the speed of a particle in the accelerator?
A scientist builds a particle accelerator. Which of the following would not help the scientist increase the speed of a particle in the accelerator?
A charged particle in a particle accelerator moves in uniform circular motion. The equation for centripetal force caused by uniform circular motion is:
The equation for magnetic force is:
Set the equations equal to each other, and solve for velocity.
The only answer choice that does not correspond to an increase in velocity is increasing the mass of the particles in the accelerator.
A charged particle in a particle accelerator moves in uniform circular motion. The equation for centripetal force caused by uniform circular motion is:
The equation for magnetic force is:
Set the equations equal to each other, and solve for velocity.
The only answer choice that does not correspond to an increase in velocity is increasing the mass of the particles in the accelerator.
Compare your answer with the correct one above
A 
current-carrying wire is placed in a uniform magnetic field oriented perpendicularly to the wire. The length of the wire is 
and the magnitude of the magnetic field is 
. What is the force on the wire?
A
We use the formula for force on a wire in a magnetic field:
Where 
= force, 
= current, 
= length of wire, and 
= magnetic mield
We use the formula for force on a wire in a magnetic field:
Where
Compare your answer with the correct one above
Which of the following influences the emf produced in a wire loop that is rotating in a magnetic field?
Which of the following influences the emf produced in a wire loop that is rotating in a magnetic field?
Recall that , where . The shape, material characteristics, and resistance do not appear in this equation. So only the size (area) of the loop influences the emf.
Recall that
Compare your answer with the correct one above
Which of the following best describes magnetic field lines?
Which of the following best describes magnetic field lines?
First, magnetic field lines, like electric field lines, can never cross. Also, unlike electric field lines, magnetic field lines are continuous—they do not have starting or ending points. Next, the force experienced by a charge in a magnetic field depends on the charge's velocity direction, not just the magnetic field. So the only remaining choice is that magnetic field lines show both the relative strength and direction of the field.
First, magnetic field lines, like electric field lines, can never cross. Also, unlike electric field lines, magnetic field lines are continuous—they do not have starting or ending points. Next, the force experienced by a charge in a magnetic field depends on the charge's velocity direction, not just the magnetic field. So the only remaining choice is that magnetic field lines show both the relative strength and direction of the field.
Compare your answer with the correct one above
A scientist builds a particle accelerator. Which of the following would not help the scientist increase the speed of a particle in the accelerator?
A scientist builds a particle accelerator. Which of the following would not help the scientist increase the speed of a particle in the accelerator?
A charged particle in a particle accelerator moves in uniform circular motion. The equation for centripetal force caused by uniform circular motion is:
The equation for magnetic force is:
Set the equations equal to each other, and solve for velocity.
The only answer choice that does not correspond to an increase in velocity is increasing the mass of the particles in the accelerator.
A charged particle in a particle accelerator moves in uniform circular motion. The equation for centripetal force caused by uniform circular motion is:
The equation for magnetic force is:
Set the equations equal to each other, and solve for velocity.
The only answer choice that does not correspond to an increase in velocity is increasing the mass of the particles in the accelerator.
Compare your answer with the correct one above
A current-carrying wire is placed in a uniform magnetic field oriented perpendicularly to the wire. The length of the wire is and the magnitude of the magnetic field is . What is the force on the wire?
A
We use the formula for force on a wire in a magnetic field:
Where = force, = current, = length of wire, and = magnetic mield
We use the formula for force on a wire in a magnetic field:
Where
Compare your answer with the correct one above
Which of the following influences the emf produced in a wire loop that is rotating in a magnetic field?
Which of the following influences the emf produced in a wire loop that is rotating in a magnetic field?
Recall that , where . The shape, material characteristics, and resistance do not appear in this equation. So only the size (area) of the loop influences the emf.
Recall that
Compare your answer with the correct one above
Which of the following best describes magnetic field lines?
Which of the following best describes magnetic field lines?
First, magnetic field lines, like electric field lines, can never cross. Also, unlike electric field lines, magnetic field lines are continuous—they do not have starting or ending points. Next, the force experienced by a charge in a magnetic field depends on the charge's velocity direction, not just the magnetic field. So the only remaining choice is that magnetic field lines show both the relative strength and direction of the field.
First, magnetic field lines, like electric field lines, can never cross. Also, unlike electric field lines, magnetic field lines are continuous—they do not have starting or ending points. Next, the force experienced by a charge in a magnetic field depends on the charge's velocity direction, not just the magnetic field. So the only remaining choice is that magnetic field lines show both the relative strength and direction of the field.
Compare your answer with the correct one above
A scientist builds a particle accelerator. Which of the following would not help the scientist increase the speed of a particle in the accelerator?
A scientist builds a particle accelerator. Which of the following would not help the scientist increase the speed of a particle in the accelerator?
A charged particle in a particle accelerator moves in uniform circular motion. The equation for centripetal force caused by uniform circular motion is:
The equation for magnetic force is:
Set the equations equal to each other, and solve for velocity.
The only answer choice that does not correspond to an increase in velocity is increasing the mass of the particles in the accelerator.
A charged particle in a particle accelerator moves in uniform circular motion. The equation for centripetal force caused by uniform circular motion is:
The equation for magnetic force is:
Set the equations equal to each other, and solve for velocity.
The only answer choice that does not correspond to an increase in velocity is increasing the mass of the particles in the accelerator.
Compare your answer with the correct one above
A current-carrying wire is placed in a uniform magnetic field oriented perpendicularly to the wire. The length of the wire is and the magnitude of the magnetic field is . What is the force on the wire?
A
We use the formula for force on a wire in a magnetic field:
Where = force, = current, = length of wire, and = magnetic mield
We use the formula for force on a wire in a magnetic field:
Where
Compare your answer with the correct one above
Which of the following influences the emf produced in a wire loop that is rotating in a magnetic field?
Which of the following influences the emf produced in a wire loop that is rotating in a magnetic field?
Recall that , where . The shape, material characteristics, and resistance do not appear in this equation. So only the size (area) of the loop influences the emf.
Recall that
Compare your answer with the correct one above
Which of the following best describes magnetic field lines?
Which of the following best describes magnetic field lines?
First, magnetic field lines, like electric field lines, can never cross. Also, unlike electric field lines, magnetic field lines are continuous—they do not have starting or ending points. Next, the force experienced by a charge in a magnetic field depends on the charge's velocity direction, not just the magnetic field. So the only remaining choice is that magnetic field lines show both the relative strength and direction of the field.
First, magnetic field lines, like electric field lines, can never cross. Also, unlike electric field lines, magnetic field lines are continuous—they do not have starting or ending points. Next, the force experienced by a charge in a magnetic field depends on the charge's velocity direction, not just the magnetic field. So the only remaining choice is that magnetic field lines show both the relative strength and direction of the field.
Compare your answer with the correct one above
A scientist builds a particle accelerator. Which of the following would not help the scientist increase the speed of a particle in the accelerator?
A scientist builds a particle accelerator. Which of the following would not help the scientist increase the speed of a particle in the accelerator?
A charged particle in a particle accelerator moves in uniform circular motion. The equation for centripetal force caused by uniform circular motion is:
The equation for magnetic force is:
Set the equations equal to each other, and solve for velocity.
The only answer choice that does not correspond to an increase in velocity is increasing the mass of the particles in the accelerator.
A charged particle in a particle accelerator moves in uniform circular motion. The equation for centripetal force caused by uniform circular motion is:
The equation for magnetic force is:
Set the equations equal to each other, and solve for velocity.
The only answer choice that does not correspond to an increase in velocity is increasing the mass of the particles in the accelerator.
Compare your answer with the correct one above
A current-carrying wire is placed in a uniform magnetic field oriented perpendicularly to the wire. The length of the wire is and the magnitude of the magnetic field is . What is the force on the wire?
A
We use the formula for force on a wire in a magnetic field:
Where = force, = current, = length of wire, and = magnetic mield
We use the formula for force on a wire in a magnetic field:
Where
Compare your answer with the correct one above
Which of the following influences the emf produced in a wire loop that is rotating in a magnetic field?
Which of the following influences the emf produced in a wire loop that is rotating in a magnetic field?
Recall that , where . The shape, material characteristics, and resistance do not appear in this equation. So only the size (area) of the loop influences the emf.
Recall that
Compare your answer with the correct one above
Which of the following best describes magnetic field lines?
Which of the following best describes magnetic field lines?
First, magnetic field lines, like electric field lines, can never cross. Also, unlike electric field lines, magnetic field lines are continuous—they do not have starting or ending points. Next, the force experienced by a charge in a magnetic field depends on the charge's velocity direction, not just the magnetic field. So the only remaining choice is that magnetic field lines show both the relative strength and direction of the field.
First, magnetic field lines, like electric field lines, can never cross. Also, unlike electric field lines, magnetic field lines are continuous—they do not have starting or ending points. Next, the force experienced by a charge in a magnetic field depends on the charge's velocity direction, not just the magnetic field. So the only remaining choice is that magnetic field lines show both the relative strength and direction of the field.
Compare your answer with the correct one above
A scientist builds a particle accelerator. Which of the following would not help the scientist increase the speed of a particle in the accelerator?
A scientist builds a particle accelerator. Which of the following would not help the scientist increase the speed of a particle in the accelerator?
A charged particle in a particle accelerator moves in uniform circular motion. The equation for centripetal force caused by uniform circular motion is:
The equation for magnetic force is:
Set the equations equal to each other, and solve for velocity.
The only answer choice that does not correspond to an increase in velocity is increasing the mass of the particles in the accelerator.
A charged particle in a particle accelerator moves in uniform circular motion. The equation for centripetal force caused by uniform circular motion is:
The equation for magnetic force is:
Set the equations equal to each other, and solve for velocity.
The only answer choice that does not correspond to an increase in velocity is increasing the mass of the particles in the accelerator.
Compare your answer with the correct one above
A current-carrying wire is placed in a uniform magnetic field oriented perpendicularly to the wire. The length of the wire is and the magnitude of the magnetic field is . What is the force on the wire?
A
We use the formula for force on a wire in a magnetic field:
Where = force, = current, = length of wire, and = magnetic mield
We use the formula for force on a wire in a magnetic field:
Where
Compare your answer with the correct one above