Question

A current of $0.6A$ produces a deflection of 30 in the tangent galvanometer. Calculate the value of current will produce a deflection of $60$.

• A. $1.2$ A
• B. $1.8$ A
• C. $2.4$ A
• D. $3.0$ A

Answer 1

The correct option is A $1.2$ A

In this question, we know that in galvanometer current is proportional to angle of deflection.

$I\propto \theta$

$I=K\theta$ (K=constant)

In $1st$ case

$0.6=K\times 30-----\left(1\right)$

In $2nd$ case

$I=K\times 60--------\left(2\right)$

Divide $1$ and $2$

$\frac{0.6}{I}=\frac{30}{60}$

$I=1.2A$