Question

Two resistances $500ohm$ and $1000ohm$ are connected in series with a battery of $1.5volt$. The voltage across the $1000ohm$ resistances is measured by a voltmeter having a resistance of $1000ohm$. The reading in the voltmeter would be then:

• A. 1.5 Volt
• B. 1.0 Volt
• C. 0.75 Volt
• D. 0.50 Volt

Answer 1

The correct option is C 0.75 Volt

The equivalent resistance of the Voltmeter $\left(1000\Omega \right)$ and the given resistance of $1000\Omega$ is $500ohms$.

Now in effect there are two resistance in the circuit each of $500\Omega$.

Hence the p.d. of $1.5volt$ will be equally divided across the two i.e., p.d. across each will be $0.75volt$.

The voltmeter will read this potential difference.