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Q. If the equivalent resistance between the terminal points $P$ and $Q$ is $4 \, \Omega $ in the given circuit, then find out the resistance of $R$ in ohms

Question

NTA AbhyasNTA Abhyas 2020Current Electricity

Solution:

Equivalent circuit is,
Solution
Therefore equivalent resistance is,
$R_{e q}=\frac{R \left(\frac{4 R}{3}\right)}{R + \frac{4 R}{3}}$
$4=\frac{4 R}{7}$
$R=7 \, \Omega $