If number of turns and radius of cross section of coil of a tangent galvanometer are doubled, then r

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5.Magnetism and Matter

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If the number of turns and radius of cross section of the coil of a tangent galvanometer are doubled, then the reduction factor $K$ will become

A

$K$

B

$2 K$

C

$4 K$

D

$\frac{K}{4}$

Solution

(a)

$K=\frac{2 R B_H}{\mu_0 N}$

$\therefore K \propto=\frac{R}{N}$ and $K^{\prime} \propto=\frac{2 R}{2 N}=K$

Standard 12

Physics

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