When the coil of the galvanometer is in equilibrium then the deflecting couple is____________________?
Correct answer: B. equal to the restoring couple
- A. zero
- B. equal to the restoring couple
- C. greater than the restoring couple
- D. smaller than the restoring couple
Explanation
At equilibrium, the net torque is zero, so the deflecting couple and restoring couple must be equal in magnitude and opposite in direction. The likely wrong choice is a, because zero refers to the net couple, not to each individual couple separately.
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