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  • If galvanometer shows null deflection in the given figure then the value of Y is <img alt="" src="https://cdn.entrance360.com/media/uploads/2023/07/15/79.jpg" style="height:110px; width:2

If galvanometer shows null deflection in the given figure then the value of Y is

Option: 1

100 \Omega


Option: 2

200 \Omega


Option: 3

300 \Omega


Option: 4

400 \Omega


Answers (1)

best_answer

V_A-V_B=3 V=i_1 Y

\mathrm{i}_1=\frac{12}{100+800+\mathrm{Y}}=\frac{12}{900+\mathrm{Y}}

\mathrm{i}_1 \mathrm{Y}=3 \Rightarrow \frac{12 \mathrm{Y}}{900+\mathrm{Y}}=3 \Rightarrow \quad \mathrm{Y}=300 \Omega

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Pankaj

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