Verified Solution • 2025–26 Session moderate

QPage 276: Q12: HC Verma: Concepts of Physics - Volume 2 Permanent Magnets Page 276: Q12 Solution: If the current is doubled, the deflection is also doubled in

⚠️ Common Exam Traps & Conceptual Pitfalls

In a tangent galvanometer the governing relation is $\tan\theta = kI$, not $\theta \propto I$; only under the small‑angle approximation ($\theta\approx\tan\theta$) does doubling the current double the observed deflection. Students often treat the angle itself as directly proportional to current and overlook this nuance.

If the current is doubled, the deflection is also doubled in

Multiple Choice Options

  • A a tangent galvanometer
  • B a moving-coil galvanometer
  • C both
  • D none

Step-by-Step Verified Solution

**Answer:** (a) a tangent galvanometer. **Step-by-Step Explanation:** In a tangent galvanometer, I _ tan _. For small angles, tan _ � _, so doubling current doubles deflection.

All Questions in this Chapter

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