MHT CET202020 Oct 2020Evening ShiftPhysicsElectromagnetic InductionActual
The area of a coil is 'A'. The coil is placed in a magnetic field which changes from ^ B _ 0^ to ^ 4 ~B ₀ ^ in time ^ t ^ . The magnitude of induced e.m.f. in the coil will be
Options
- A3 AB ₀ t
- B4 AB ₀ t
- C3 ~B ₀ At
- D4 ~B ₀ At
Correct answer
A. 3 AB ₀ t
Step-by-step solution
dB dt = d dt (4 B ₀- B ₀ )= 3 ~B ₀ t e= d d t = d d t A 3 B₀= 3 B₀ A t