question_answer

The resistance \[500\Omega \] and \[1000\Omega \] are connected in series with battery of \[1.5\] volts. The voltage across the 100 ohm resistance is measured by a voltmeter having a resistance of 1000 ohm. The reading in voltmeter would be

A) \[\text{1}\text{.5 volt}\]         

B)         \[\text{1}.0\text{ volt}\]

C) \[0.\text{75 volt}\]               

D)         \[0.\text{5 volt}\]

Correct Answer: C

Solution :

 Reading of the voltmeter is equal to the voltage across the resultant resistance of the voltmeter and the resistance across which the voltmeter is connected. So, the equivalent circuit is as shown below: Since, the above two resistances are equal, voltage drop across each is half the applied voltage.