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  • For what value of R will the current in galvanometer zero ? &

For what value of R will the current in galvanometer zero ?

 

Option: 1

5\; \Omega


Option: 2

2\; \Omega


Option: 3

7\; \Omega


Option: 4

1\; \Omega


Answers (1)

best_answer

i=\frac{12}{R+5}

Potential\: difference\: across \mathrm{R}=2 \mathrm{~V}=\frac{12}{\mathrm{R}+5} \times \mathrm{R}

\begin{array}{ll} \therefore & 2=\frac{12}{R+5} \times R \\ \Rightarrow & R+5=6 R \\ \Rightarrow & R=1 \Omega \end{array}

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Shailly goel

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