Question

In a meter bridge experiment the null deflection is obtained at a length of 25cm. When a standard resistance of 5 ohm is employed. The value of resistance in the left gap is

• A. 2$\Omega$
• B. 1.66$\Omega$
• C. 4$\Omega$
• D. 1.2$\Omega$

Answer 1

The correct option is B 1.66$\Omega$

$\Rightarrow \frac{R}{5}=\frac{25}{100-25}$ (standard result)

$\frac{R}{5}=\frac{25}{75}$

$R=\frac{5}{3}=1.66\Omega$