Explain Electromagnetic Induction
Physics · Flashcards
PHYSICS · FLASHCARDS
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QUESTION
Identify the meaning of the minus sign in
ε
=
−
N
Δ
Φ
Δ
t
\varepsilon=-N\frac{\Delta\Phi}{\Delta t}
ε
=
−
N
Δ
t
ΔΦ
.
QUESTION
What is the direction rule for induced current when the magnetic flux increases?
QUESTION
A coil has
N
=
200
N=200
N
=
200
and flux per turn changes at
d
Φ
d
t
=
0.01
Wb s
−
1
\frac{d\Phi}{dt}=0.01\ \text{Wb s}^{-1}
d
t
d
Φ
=
0.01
Wb s
−
1
. Find
∣
ε
∣
|\varepsilon|
∣
ε
∣
.
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ANSWER
2
V
2\ \text{V}
2
V
.
∣
ε
∣
=
N
∣
d
Φ
d
t
∣
=
200
×
0.01
=
2
V
|\varepsilon| = N|\frac{d\Phi}{dt}| = 200 \times 0.01 = 2\ \text{V}
∣
ε
∣
=
N
∣
d
t
d
Φ
∣
=
200
×
0.01
=
2
V
.
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