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MHT CET Medical202621 April 2026Morning ShiftPhysicsMagnetic Effects of CurrentActual

The magnetic field inside the solenoid is

Options

  1. Adirectly proportional to its length.
  2. Bdirectly proportional to current
  3. Cinversely proportional to current
  4. Dinversely proportional to total number of turns

Correct answer

B. directly proportional to current

Step-by-step solution

The magnetic field inside a long solenoid is given by the formula: B = ₀ n I where n is the number of turns per unit length ( n = N L ) and I is the current flowing through the solenoid. From the formula, it is clear that the magnetic field B is directly proportional to the current I ( B I ). It is directly proportional to the total number of turns N and inversely proportional to the length L . Thus, the magnetic field is directly proportional to the current. Answer: directly proportional to current

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