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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 

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a

0.2%

b

0.1%

c

2%

d

1%

answer is D.

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Detailed Solution

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χ=2×10−2; μr=1+χ=1.02 ;

Binitial=μ0ni ;   Bfinal=μ0μrni

Bfinal−BinitialBinitial×100=μr−11×100=0.02×100=2%

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