A wire of length 100 m is tightly wounded on a hollow tube of radius 5 mm and length 1 m . A current of 1 A is flowing in the wire. Then magnetic field strength inside the tube will be :-

Question

A wire of length 100 m is tightly wounded on a hollow tube of radius 5 mm and length 1 m . A current of 1 A is flowing in the wire. Then magnetic field strength inside the tube will be :-, 4 T, 4 mT, 40 mT, 40 T

MARKS App · Accepted Answer

Field due to a solenoid = μ 0 ni Given i = 1 A n = 1 0 0 2 π × 5 × 1 0 - 3 ∴ B = μ 0 ni = 4 π × 1 0 - 7 × 1 0 0 × 1 2 π × 5 × 1 0 - 3 = 4 mT

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