Q. When $\sqrt{3}\ ampere$ current is passed in a tangent galvanometer, there is a deflection of $30{^\circ}$ in it. The deflection obtained when $3\ amperes$ current is passed, is
A) 30${^\circ}$
B) 45${^\circ}$
C) 60${^\circ}$
D) 75${^\circ}$
Explanation
(b) $i \propto \tan\theta \Rightarrow \frac{i_{1}}{i_{2}} = \frac{\tan\theta_{1}}{\tan\theta_{2}} \Rightarrow \frac{\sqrt{3}}{3} = \frac{\tan{30{^\circ}}}{\tan\theta_{2}} \Rightarrow \theta = 45{^\circ}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.