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MHT CET202620 April 2026Morning ShiftPhysicsMagnetic Effects of CurrentActual

A long solenoid carrying a current produces a magnetic field ' B ' along its axis. If the currunt is tripled and the number of turns per cm is halved then new value of magnetic field will be

Options

  1. AB 2
  2. BB
  3. C3 2 B
  4. D3B

Correct answer

C. 3 2 B

Step-by-step solution

The magnetic field produced by a long solenoid along its axis is given by B = ₀ n I , where n is the number of turns per unit length and I is the current. Given that the new current is I' = 3I and the new number of turns per unit length is n' = n 2 . The new magnetic field B' is: B' = ₀ n' I' B' = ₀ ( n 2 ) (3I) B' = 3 2 ₀ n I B' = 3 2 B Answer: 3 2 B

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