Q. A battery of $e$.m.f. 3 volt and internal resistance $1.0\ ohm$ is connected in series with copper voltmeter. The current flowing in the circuit is 1.5 amperes. The resistance of voltmeter will be
A) Zero
B) $1.0\ ohm$
C) $1.5\ ohm$
D) $2.0\ ohm$
Explanation
(b) $3 = 1.5(1 + r) \Rightarrow r = 1\Omega$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.