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      Question

      A circular coil of wire consisting of 120 turns, each of

      radius 12 cm carries a current of 0.30 A. What is the magnitude of the magnetic field B at the centre of the coil? (π = 3.14 )
      A 18.84 Γ— 10^βˆ’5 T Correct Answer Incorrect Answer
      B 20.84 Γ— 10^βˆ’5 T Correct Answer Incorrect Answer
      C 18 Γ— 10^βˆ’5 T Correct Answer Incorrect Answer
      D 10.84 Γ— 10^βˆ’5 T Correct Answer Incorrect Answer

      Solution

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