To verify Ohm's law, a student is provided with a test resistor \(\mathrm{R}_{\mathrm{T}}\), a high resistance \(\mathrm{R}_{1}\), a small resistance \(\mathrm{R}_{2}\), two identical galvanometers \(\mathrm{G}_{1}\) and \(\mathrm{G}_{2}\), and a variable voltage source V. The correct circuit to carry out the experiment is

JEE Advanced · 2010 · 11 Apr 2010 · Paper 1 · Current Electricity

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

Answer: (C)

To verify Ohm's law, we need to measure both voltage across and current through the test resistor

R_{T}

G_{1}

(with high resistance

R_{1}

in series) acts as a voltmeter to measure voltage across

R_{T}

G_{2}

(with small shunt resistance

R_{2}

in parallel) acts as an ammeter to measure current through

R_{T}

. The correct configuration has

G_{1} + R_{1}

in parallel with

R_{T}

(voltmeter connection) and

G_{2}

with

R_{2}

in series with

R_{T}

(ammeter connection). Circuit (C) shows this arrangement.

JEE Advanced · 2010 · 11 Apr 2010 · Paper 1 · Single correct option