MHT CET202120 Sep 2021Morning ShiftPhysicsMagnetic Effects of CurrentActual
The magnetic field at the centre of a current carrying circular coil of area ' A ' is ' B '. The magnetic moment of the coil is ( ₀= permeability of free space)
Options
- A2 BA ^ 3 / 2 ₀
- BBA ^ 3 / 2 ₀
- C₀ 2 BA ^2
- D2 BA ^2 ₀
Correct answer
A. 2 BA ^ 3 / 2 ₀
Step-by-step solution
aligned & A= R^2 & R= A & B= ₀ I 2 R aligned Magnetic Moment, aligned & M=I A= 2 A B R ₀ & = 2 BA ^ 3 / 2 ₀ aligned