MHT CET202015 Oct 2020Morning ShiftPhysicsMagnetic Effects of CurrentActual
A toroid has a non-ferromagnetic wire of inner radius ' r ₁ ^ and outer radius ' r ₂ ', around which 'N' turns of wire are wound. If the current in the wire is ' I ^ , then the magnetic field inside the toroid is ( ₀= . permeability of free space )
Options
- A₀ NI ( r ₁+ r ₂ )
- B₀ NI ( r ₂- r ₁ )
- C₀ NI ( r ₁+ r ₂ )
- D₀ NI ( r ₂- r ₁ )
Correct answer
A. ₀ NI ( r ₁+ r ₂ )
Step-by-step solution
aligned r &= r₁+r₂ 2 B &=n ₀ I= ₀ I N 2 r = ₀ I N 2 2 (r₁+r₂ ) &= ₀ I N (r₁+r₂ ) aligned