Question

A galvanometer has resistance of 500 $\Omega$ . It is shunted so that its sensitivity decreases by 100 times. The shunt resistance is

• A. 0.0505$\Omega$
• B. 5.05$\Omega$
• C. 50.5$\Omega$
• D. 505$\Omega$

Answer 1

Answer: (B)

5.05$\Omega$

Let shunt resistance be x

= $Req=\frac{500x}{500+x}$

$\left(\frac{500x}{500+x}\right)=\frac{1}{100}\times 500$

$99x=500$

$x=5.05\Omega$