Q. $50\ \Omega$ and $100\ \Omega$ resistors are connected in series. This connection is connected with a battery of $2.4\ volt.$ When a voltmeter of $100\ \Omega$ resistance is connected across $100\ \Omega$ resistor, then the reading of the voltmeter will be
A) $1.6\ V$
B) $1.0\ V$
C) $1.2\ V$
D) $2.0\ V$
Explanation
(c) Equivalent resistance of the circuit $R_{eq} = 100\Omega$
Current through the circuit $i = \frac{2.4}{100}A$
P.D. across combination of voltmeter and $100\Omega$
Resistance $= \frac{2.4}{100} \times 50 = 1.2V$
Since the voltmeter and $100\ \Omega$ resistance are in parallel, so the voltmeter reads the same value $i.e.\ 1.2V$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.