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Magnetism — JEE physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceJEE physicsMagnetism1 Mark
MCQ
The sensitivity of a tangent galvanometer is increased if
  • A
    Number of turn decreases
  • ✓
    Number of turn increases
  • C
    Field increases
  • D
    None of the above
✓

Answer

Correct option: B.
Number of turn increases
Sensitivity $S=\frac{\theta}{i}=\frac{\theta}{K \tan \theta}$ where $K=\frac{2 R B_H}{\mu_0 N}$
For increasing sensitivity $K$ should be decreased and hence number of turns should be increased.

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