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JIPMER 2004

Exam: JIPMER
Year: 2004
Subject: Physics
Chapter: Current Electricity

JIPMER 2004 · Physics · Current Electricity

When a resistance of 9 is connected at the ends of a battery, its...

When a resistance of

9 \Omega

is connected at the ends of a battery, its potential difference decreases from 40 V to 30 V. The internal resistance of the battery is

Options

A $3 \Omega$
B $6 \Omega$
C $1.5 \Omega$
D $4 \Omega$

Correct answer

A. $3 \Omega$

Step-by-step solution

E=40 \mathrm{~V}, V=30 \mathrm{~V}, R=9 \Omega

Internal resistance

r=\left(\frac{E}{V}-1\right) R=\left(\frac{40}{30}-1\right) 9

=\frac{1}{3} \times 9=3 \Omega

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