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5.Magnetism and Matter
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When $\sqrt 3 $ $ampere$ current is passed in a tangent galvanometer, there is a deflection of $ 30° $ in it. The deflection obtained when $3$ $ampere$ current is passed, is.....$^o$
A
$30$
B
$45$
C
$60$
D
$75$
Solution
(b)$i \propto \tan \theta \Rightarrow \frac{{{i_1}}}{{{i_2}}} = \frac{{\tan {\theta _1}}}{{\tan {\theta _2}}} \Rightarrow \frac{{\sqrt 3 }}{3} = \frac{{\tan {{30}^o}}}{{\tan {\theta _2}}} \Rightarrow \theta = {45^o}$
Standard 12
Physics
