Question

A copper disc of radius 0.1 m is rotated about its natural axis with 10 rps in a uniform magnetic field of 0.1 T with its plane perpendicular to the field.
The emf induced across the radius of the disc is
1)π × 10 V
2) 2π×10 V
3) π x 10-2 V
4) 2πX10-2 V
The correct option is 3 .
Could you guys give the correct solution please.​

Answer 1

Answer:

axis with 10 rps in a uniform magnetic field of 0.1 T with its plane perpendicular to the field.

The emf induced across the radius of the disc is