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

Options

  1. A4   T
  2. B4   mT
  3. C40 mT
  4. D40 T

Correct answer

B. 4   mT

Step-by-step solution

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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