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MHT CET202613 April 2026Morning ShiftPhysicsMagnetic Effects of CurrentActual

If the number of turns in the coil of a moving coil galvanometer decreases, the resistance of the galvanometer,

Options

  1. Adecreases
  2. Bincreases
  3. Cremains the same
  4. Dmay increase or decrease

Correct answer

A. decreases

Step-by-step solution

The resistance of a coil is given by R = l A . The total length of the wire in the coil is l = N perimeter of one turn , where N is the number of turns. Thus, the resistance of the galvanometer is directly proportional to the number of turns ( R N ). When the number of turns in the coil decreases, the total length of the wire decreases. Consequently, the resistance of the galvanometer decreases. Answer: decreases

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