Question

The induced emf can be produced in a coil by
A. moving the coil with uniform speed inside uniform magnetic field
B. moving the coil with non uniform speed inside uniform magnetic field
C. rotating the coil inside the uniform magnetic field
D. changing the area of the coil inside the uniform magnetic field
Choose the correct answer from the options given below :

• A. B and D only
• B. C and D only
• C. B and C only
• D. A and C only

Answer 1

Answer: (B)

C and D only

Answer 2

Induced emf can be induced in a coil by changing magnetic flux. And 𝜙 = 𝐵⃗ . 𝑑𝐴⃗⃗⃗⃗⃗ By rotating coil, angle between coil and magnetic field changes and hence flux changes. By changing area, magnetic flux changes.