Physics · 2019
JEE Main · 8 April 2019, Shift 2 · Q29
In the circuit shown, a four-wire potentiometer is made of a 400 cm long wire, which extends between A and B. The resistance per unit length of the…
In the circuit shown, a four-wire potentiometer is made of a $\displaystyle 400$ cm long wire, which extends between A and B. The resistance per unit length of the potentiometer wire is $\displaystyle \mathrm{r}=0.01 \Omega / \mathrm{cm}$. If an ideal voltmeter is connected as shown with jockey J at $\displaystyle 50$ cm from end A, the expected reading of the voltmeter will be :
Official answer
(1)
0.$\displaystyle 25$ V
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JEE Main 2019 Physics question, with the answer from NTA’s final answer key. Where our answers come from.