Q. A candidate connects a moving coil voltmeter $V$ and a moving coil ammeter $A$ and resistor $R$ as shown in figure? If the voltmeter reads 10 V and the ammeter reads 2 A and than R is
A) Equal to 5 $\Omega$
B) Greater than 5 $\Omega$
C) Less than 5 $\Omega$
D) Greater or less than 5 $\Omega\ $depending upon its material
Explanation
(c) Potential difference across $C\ \ and\ D$ = 10 V. If $x$ is the resistance of ammeter, than
$x + R = 10/2$ = 5 or $R = 5 - x < 5\ \Omega$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.