Question

In a tangent galvanometer when a current of $\left(2/3\right)A$ passes, the deflection is ${30}^o$. If the deflection is ${60}^o$, the current that is passing is :

• A. $2A$
• B. $1.6A$
• C. $1.8A$
• D. $1.2A$

Answer 1

Answer: (A)

$2A$

$\frac{i_1}{i_2}=\frac{\tan {\theta }_1}{\tan {\theta }_2}$
$\frac{2/3}{i_2}=\frac{\tan {30}^0}{\tan {60}^0}$

$i_2=\frac{2\times \sqrt{3}}{3\times \frac{1}{\sqrt{3}}}$
$i_2=2A$