Manipal MET2020PhysicsElectromagnetic Induction
Two coils have mutual inductance of 1.5 H . If current in primary coil is suddenly raised to 5 A in one milli second, the induced emf in the secondary coil is
Options
- A75 V
- B750 V
- C7500 V
- D75000 V
Correct answer
C. 7500 V
Step-by-step solution
Magnetic flux linked with the secondary due to current in the primary. ₂=M I₁ d ₂ d t =M d l₁ d t Induced emf in the secondary ₂= d ₂ d t =M d l₁ d t where, M= mutual inductance =15 H d l₁ d t = 5 1 10⁻³ =5000 ~A / s ₂=-1.5 5000 ~V =7.5 1000 V=7500 ~V