Question

In a meter bridge experiment, the value of unknown resistance is $2\Omega .$ To get the balancing point at 40 cm distance from the same end, the resistance in the resistance box will be

• A. $0.5\Omega$
• B. $3\Omega$
• C. $20\Omega$
• D. $80\Omega$

Answer 1

The correct option is B $3\Omega$

$X=R\left[\frac{l}{100-l}\right]$
$2=R\left[\frac{40}{60}\right]$
$\frac{12}{4}=R$
$R=3\Omega$