KCET2020PhysicsElectromagnetic Induction
The current in a coil of inductance 0.2 H changes from 5 ~A to 2 ~A in 0.5 ~s . The magnitude of the average induced emf in the coil is
Options
- A0.6 ~V
- B1.2 ~V
- C30 ~V
- D0.3 ~V
Correct answer
B. 1.2 ~V
Step-by-step solution
Given, L=0.2 H , I₁=5 ~A , I₂=2 ~A and t=0.5 ~s The magnitude of induced emf, |e|=L d I d t =L I t = 0.2 (5-2) 0.5 =1.2 ~V