IIT-JEE 2010 · Paper 1 · Physics Q60

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PhysicsSingle correct+3 / -1Question 60 of 84

To verify Ohm's law, a student is provided with a test resistor $R_T$ , a high resistance $R_1$ , a small resistance $R_2$ , two identical galvanometers $G_1$ and $G_2$ , and a variable voltage source V. The correct circuit to carry out the experiment is

G₁ with R₂ in parallel (shunt) is connected across R_T; this is in series with G₂ and R₁ in series, all across the variable source V.

G₁ with R₁ in parallel is connected across R_T; this is in series with G₂ and R₂ in series, across the variable source V.

G₁ in series with R₁ (a voltmeter) is connected across R_T; this is in series with G₂ shunted by R₂ (an ammeter), across the variable source V.

G₁ in series with R₂ is connected across R_T; this is in series with G₂ shunted by R₁, across the variable source V.

Answer and worked solution

Official answer: C

Meters from galvanometers.

A voltmeter is a galvanometer with a high resistance in series; it goes in parallel with $R_T$ .
An ammeter is a galvanometer with a small shunt in parallel; it goes in series with $R_T$ .

Circuit (C) has $G_1$ in series with $R_1$ across $R_T$ and $G_2$ shunted by $R_2$ in series with the source.

(C)

Topics:Metre bridge and Ohm's law experiments Ammeters and voltmeters

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IIT-JEE 2010 · Paper 1, Physics question 60