Question

An ammeter is obtained by shunting a $30\Omega$ galvanometer with a $30\Omega$ resistance. What additional shunt should be connected across it to double its range?

• A. $10\Omega$
• B. $15\Omega$
• C. $30\Omega$
• D. $5\Omega$

Answer 1

The correct option is B $15\Omega$

$G=\frac{30}{2}=15\Omega S=\frac{G}{n-1}=\frac{15}{2-1}n=\frac{newrange}{oldrange}S=15\Omega$