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

Q: 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 potentiometer wire is $r = 0.01\, \Omega /cm$. If an ideal voltmeter is connected as shown with jockey $J$ at $50\, cm$ from end $A$, the expected reading of the voltmeter will be: ............... $V$

c Resistance of wire $A B=400 \times 0.01=4 \,\Omega$ $\mathrm{i}=\frac{3}{6}=0.5\, \mathrm{A}$ Now voltmeter reading $=$ $i$ (Resistance of $50 \,\mathrm{cm}$ length) $=(0.5 \mathrm{A})(0.01 \times 50)=0.25$ $volt$

SECTION - A [PHYSICS - MCQ]

GSEB - English Medium

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 potentiometer wire is $r = 0.01\, \Omega /cm$. If an ideal voltmeter is connected as shown with jockey $J$ at $50\, cm$ from end $A$, the expected reading of the voltmeter will be: ............... $V$

A$0.75$
B$0.20$
C$0.25$
D$0.50$

JEE MAIN 2019, Medium

STD 11 Science
NEET
STD 12 - 3. current electricity
Physics

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