AP Physics C Electricity and Magnetism Quiz
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ELECTRIC CHARGES, FIELDS, AND GAUSS'S LAW
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Electric charge is a conserved property (C) that can be positive or negative; like charges repel and unlike charges attract. Electric force between point charges acts along the line joining them and obeys Coulomb's Law. Three point charges lie on a line: q1=+2.0×10−6 Cq_1=+2.0\times10^{-6}\ \text{C} at x=0x=0, q2=−1.0×10−6 Cq_2=-1.0\times10^{-6}\ \text{C} at x=0.30 mx=0.30\ \text{m}, and q3=+2.0×10−6 Cq_3=+2.0\times10^{-6}\ \text{C} at x=0.60 mx=0.60\ \text{m}. For q2q_2, the forces from q1q_1 and q3q_3 have magnitudes F21=k∣q2q1∣(0.30)2,F23=k∣q2q3∣(0.30)2F_{21}=k\frac{|q_2q_1|}{(0.30)^2},\quad F_{23}=k\frac{|q_2q_3|}{(0.30)^2} and superposition requires adding these vectors to find the net force. Determine the net electric force on q2q_2 placed in an electric field.
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