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Magnetism — JEE physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceJEE physicsMagnetism1 Mark
Question
Assertion : Reduction factor $(K)$ of a tangent galvanometer helps in reducing deflection to current.
Reason $\quad$ : Reduction factor increases with increase of current.
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Answer

(c) The reduction factor of tangent galvanometer is$K=\frac{B_H}{G}=B_H \times \frac{2 r}{n \mu_0}$Thus reduction factor of a tangent galvanometer depends upon the geometry of its coil. It increases with increase of radius and decreases with increase in number of turn of the coil of the galvanometer.

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