Question

When $\sqrt { 3 }$ampere current is passed in a tangent galvanometer, there is a deflection of 30° in it. The deflection obtained when 3 amperes current is passed, is

• A. 30°
• B. 45°
• C. 60°
• D. 75°

Answer 1

Answer: (B)

45°

Answer 2

$i \propto \tan \theta \Rightarrow \frac { i _ { 1 } } { i _ { 2 } } = \frac { \tan \theta _ { 1 } } { \tan \theta _ { 2 } } \Rightarrow \frac { \sqrt { 3 } } { 3 } = \frac { \tan 30 ^ { \circ } } { \tan \theta _ { 2 } } \Rightarrow \theta = 45 ^ { \circ }$