First slide

Magnetic flux and induced emf

Question

A coil having n turns and resistance $RΩ$ is connected with a galvanometer of resistance 4 $RΩ$ . This combination is moved in time t seconds from a magnetic field W₁ weber to W₂ weber. The induced current in the circuit is

Moderate

A

$- \frac{W_{2} - W_{1}}{5 Rnt}$
B

$- \frac{n (W_{2} - W_{1})}{5 Rt}$
C

$- \frac{(W_{2} - W_{1})}{Rnt}$
D

$- \frac{n (W_{2} - W_{1})}{Rt}$

Solution

$i = \frac{e}{R} = \frac{- N}{R} \frac{(ϕ_{2} - ϕ_{1})}{Δt} = \frac{- n (W_{2} - W_{1})}{5 Rt}$

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