Q. A voltmeter having resistance of $50 \times 10^{3}\ ohm$ is used to measure the voltage in a circuit. To increase the range of measurement 3 times the additional series resistance required is
A) $10^{5}\ ohm$
B) $150\ k.ohm$
C) $900\ k.ohm$
D) $9 \times 10^{6}ohm$
Explanation
(a) $R = G(n - 1) = 50 \times 10^{3}(3 - 1) = 10^{5}\Omega$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.