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In a meter bridge experiment, for measuring unknown resistance $\mathrm{ 'S',}$ the null point is obtained at a distance $\mathrm{ 30 \mathrm{~cm}}$ from the left side as shown at point $\mathrm{D.}$ If $\mathrm{R}$ is $\mathrm{5.6 \; \mathrm{k} \Omega,}$ then the value of unknown resistance ' $\mathrm{'\mathrm{S} '}$ will be ____________ $\mathrm{ \Omega}$ .

Option: 1
2400

Option: 2
-

Option: 3
-

Option: 4
-

Answers (1)

best_answer

$\mathrm{\frac{S}{R} =\frac{30}{70} }$

$\mathrm{\frac{S}{5.6} =\frac{3}{7} }$

$\mathrm{S =\frac{3}{7} \times 5.6 }$

$\mathrm{=3 \times 0.8 }$

$\mathrm{S =2.4 \mathrm{k} \Omega }$

$\mathrm{\therefore S =2400 \Omega}$

The value of unknown resistance 's' will be $\mathrm{2400 \Omega}$

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