First slide

Magnetic flux and induced emf

Question

In a circuit with a coil of resistance 2 ohms, the magnetic flux changes from 2.0 Wb to 10.0 Wb in 0.2 second. The charge that flows in the coil during this time is

Moderate

A

5.0 coulomb
B

4.0 coulomb
C

1.0 coulomb
D

0.8 coulomb

Solution

$ΔQ = \frac{Δϕ}{R} = \frac{(10 - 2)}{2} = 4 C$

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