First slide

Magnetic flux and induced emf

Question

A coil has 2000 turns and area of 70cm². The magnetic field perpendicular to the plane of the coil is 0.3 Wb/m² and takes 0.1sec to rotate through 180^o. The value of the induced e.m.f. will be

Moderate

A

8.4 V
B

84 V
C

42 V
D

4.2 V

Solution

$\begin{array}{l} e = - \frac{NBA (\cos θ_{2} - \cos θ_{1})}{Δt} \\ = - 2000 \times 0 .3 \times 70 \times 10^{- 4} \frac{(\cos 180 - \cos 0)}{0 .1} \\ \Rightarrow e = 84 V \end{array}$

Get Instant Solutions

When in doubt download our app. Now available Google Play Store- Doubts App

Recieve an sms with download link

Doubts App

OR

SCAN ME

Doubts App

Doubts App