NEET2019PhysicsMagnetic Effects of CurrentActual
The magnetic field (B) inside a long solenoid having n turns per unit length and carrying current I when iron core is kept in it is ( ₀= permeability of vacuum, = magnetic susceptibility)
Options
- A₀ n I(1- )
- B₀ n I
- C₀ n I^2(1+ )
- D₀ n I(1+ )
Correct answer
D. ₀ n I(1+ )
Step-by-step solution
Magnetic field inside a long solenoid with an iron core inside it is B= n I But = ₀(1+ ) B= ₀(1+ ) n I