Q.

The free space inside a current carrying toroid is filled with a material of susceptibility 2×10-2. The percentage increase in the value of magnetic field inside the toroid will be             [2023]

1 2%  
2 0.2%  
3 0.1%  
4 1%  

Ans.

(1)

As χm=2×10-2

μr=1+χm=1.02  B=μrB0=1.02B0

So percentage increase in magnetic field=2%