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A voltmeter having a resistance of 1800 ...

A voltmeter having a resistance of `1800 Omega` employed to measure the potential difference across a `200 Omega` resistor which is connected to the terminals of a dc power supply having an emf of 50 V and an internal resistance of `20 Omega`. What is the percentage decrease in the potential difference across the `200 Omega` resistor as a result of connecting the voltmeter across it?

A

`1%`

B

`5%`

C

`10%`

D

`25%`

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The correct Answer is:
A
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