Question

AB is a uniform wire of resistance $2000\,\Omega$ and C is the midpoint of Ag^A voltmeter of resistance $1000\,\Omega$ is connected between A arid B.. Then the reading of the voltmeter, when the p.d. is applied across AB is 150 V, is

• A. 75 V
• B. 50 V
• C. 100 V
• D. 150 V

Answer 1

Answer: (B)

50 V

Answer 2

Effective resistance of voltmeter (1000 $\Omega$) and half of resistor AB (i.e. 1000 $\Omega$) in parallel becomes 500 $\Omega$
150 V will be divided in the ratio of 500 $\Omega$ : 1000 $\Omega$ i.e. 50 : 100 V Voltmeter will read 50 V.