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Q.

The current in the windings on a toroid is  2A.There are 400 turns and the mean radius is 40cm. If the magnetic field inside is 1T, the relative permeability of core of toroid is

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a

2500

b

2000

c

1500

d

1000

answer is B.

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Detailed Solution

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B=μnI
1=μr4π×10−74002π×0.4×2⇒μr=1044=2500

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