Question

In a tangent galvanometer a current of $0.1A$ produces a deflection of ${30}^o$. The current required to produced a deflection of ${60}^o$ is

• A. $0.2A$
• B. $0.3A$
• C. $0.4A$
• D. $0.5A$

Answer 1

The correct option is B $0.3A$

$i\alpha tany=\frac{i_1}{i_2}=\frac{{tany}_2}{{tany}_2}\Rightarrow \frac{0.1}{22}=\frac{{\tan 30}^0}{{\tan 60}^0}$

$=\frac{1}{3}\Rightarrow i_2=0.3A$