Question

When a current of $100\mu \text{A}$ is passed through a galvanometer, it gives a full deflection of $50\text{divisions}$. If resistance of galvanometer is $1000\Omega$, its voltage semitivity is

• A. $500\text{div/V}$
• B. $500\text{div/mV}$
• C. $5\text{div/V}$
• D. $5\text{div/mV}$

Answer 1

The correct option is A $500\text{div/V}$

Full deflection voltage is given by, $V_g=I_g.G$

$\therefore V_g=(100\times {10}^{-6})\times 1000=0.1\text{V}$

Voltage senritivity, $V_s=\frac{{\theta }_{max}}{V_g}$

$V_s=\frac{50}{0.1}=500\text{div/V}$

Hence, option $\left(A\right)$ is the correct answer.