Q.

The centres of the turns of a toroid form a circle with a radius of 14.0 cm. The cross-sectional area of each turn is 3.00 cm2. It is wound with 5278 turns of fine wire, and the wire carries a current of 4.00 A. The core is filled with a paramagnetic material of magnetic susceptibility 2.90×10-4. What would the magnitude of the magnetic field within the substance

1 12.6 mT  
2 30.16 mT  
3 10.6 mT  
4 16.6 mT  

Ans.

(2)

D=μ0NI2πR