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JEE Main202228 Jul 2022Morning ShiftPhysicsMagnetic Effects of CurrentActual

The current sensitivity of a galvanometer can be increased by : (A) decreasing the number of turns (B) increasing the magnetic field (C) decreasing the area of the coil (D) decreasing the torsional constant of the spring Choose the most appropriate answer from the options given below :

Options

  1. A(B) and (C) only
  2. B(C) and (D) only
  3. C(A) and (C) only
  4. D(B) and (D) only

Correct answer

D. (B) and (D) only

Step-by-step solution

The current in the galvanometer is calculated by i = K N A B θ . Therefore, the sensitivity of the galvanometer, d θ d i = N A B K Hence, only options B and D are correct.

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