Question

$50 \Omega$ and $100 \Omega$ resistors are connected in series. This connection is connected with a battery of 2.4 volts. 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

Answer 1

Answer: (C)

1.2 V

Answer 2

Equivalent resistance of the circuit $R _ { e q } = 100 \Omega$ current through the circuit

P.D. across combination of voltmeter and 100 Ω resistances $= \frac { 2.4 } { 100 } \times 50 = 1.2 \mathrm {~V}$

Since the voltmeter and 100 Ω resistance are in parallel, so the voltmeter reads the same value i.e. 1.2V.