First slide

Magnetic flux and induced emf

Question

A planar loop of wire rotates in a uniform magnetic field. Initially, at t=0, the plane of the loop is perpendicular to the magnetic field. If it rotates with a period of 10s about an axis in its plane then the magnitude of induced emf will be maximum and minimum, respectively at:

Moderate

A

2.5 s, 5.0 s
B

5.0 s, 7.5 s
C

2.5 s, 7.5 s
D

5.0 s, 10.0 s

Solution

$∴ ω = \frac{2 π}{T} = \frac{π}{5}$
When $ω t = \frac{π}{2}$ $∵ ϕ$ will have minimum value and $e$ will be maximum
$\Rightarrow t = \frac{\frac{π}{2}}{\frac{π}{5}} = 2.5 \sec$
When $ω t = π$ $∵ ϕ$ will have maximum value and $e$ will be minimum
$\Rightarrow t = \frac{π}{π / 5} = 5 \sec$

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