JEE Main 2022 Physics question
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 :
Answer: (D)
Solution
At equilibrium NiAB = , so the current sensitivity is = NAB/k. It increases on increasing the
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