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Q. Find out the value of resistance $R$ in figure.Physics Question Image

Current Electricity

Solution:

Potential difference across $C$ and $D$ is $100\, V$.
image
Hence, $I_{1}=\frac{100}{100}=1\, A , V_{A C}=120-100=20\, V$
And $I=\frac{20}{10}=2 A$. Hence, $I_{2}=2-1=1\, A$
$R=100 / I_{2}=100\, \Omega$