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Q.

A toroid has a core of inner radius 21 cm and outer radius 23 cm, around which 2000 turns of a wire are wound. If the current in the wire is 11 A, what is the magnetic field outside the toroid, inside the core of the toroid and in the empty space surrounded by the toroid

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a

0,0.4×10−2T,0

b

4×10−2T,0,0

c

0,2×10−2T,0

d

2×10−4T,0,4×10−4T

answer is C.

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Detailed Solution

Field at out side and empty space is zero. Field inside the core of the toroid

B=μ0Ni2πr  where r=r1+r22

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