First slide

Magnetic flux and induced emf

Question

The magnetic field in a coil of 100 turns and 40 square cm area is increased from 1 Tesla to 6 Tesla in 2 second. The magnetic field is perpendicular to the coil. The e.m.f. generated in it is

Moderate

A

10⁴V
B

1.2 V
C

1.0 V
D

10^-2V

Solution

$\begin{array}{l} e = - N (\frac{ΔB}{Δt}) \cdot Acos θ = - 100 \times \frac{(6 - 1)}{2} \times (40 \times 10^{- 4}) \cos 0 \\ \Rightarrow | e | = 1 V \end{array}$

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