Question 285: Current Electricity

Question

A 72 $\Omega$ galvanometer is shunted by a resistance of 8 $\Omega$. The percentage of the total current which passes through the galvanometer is :

Accepted Answer

From the given setup
$y 	imes {R_G} = (x - y)({R_S})$
$ \Rightarrow y 	imes 72 = (x - y) 	imes 8$
$ \Rightarrow 9y = x - y$
$ \Rightarrow y = {x \over {10}}$ or 10% of x

Answer

0.1%

Answer

10%

Answer

25%

Answer

0.25%

Current Electricity

A 72 \Omega galvanometer is shunted by a resistance of 8 \Omega. The percentage of the total current which passes through the galvanometer is :

Choose the correct answer: