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  4. What is the value of unknown resistance R, if galvanometer shows null deflection in the given meter bridge set up ?

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Q. What is the value of unknown resistance $R$, if galvanometer shows null deflection in the given meter bridge set up ?Physics Question Image

Current Electricity

Solution:

For null deflection in meter bridge
$\frac{R_{1}}{R_{2}}=\frac{l}{\left(100-l\right)}$;
$\therefore \frac{65}{R_{1}}=\frac{40}{100-40}=\frac{40}{60}$
$R_{1}=65\times\frac{60}{40}=97.5\,\Omega$