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A voltmeter of resistance 20000 Omega re...

A voltmeter of resistance `20000 Omega` reads 5 volt. To make it read 20 volt, the extra resistance required is

A

`40000 Omega` in parallel

B

`60000 Omega` in parallel

C

`60000 Omega` in series

D

`40000 Omega` in series

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The correct Answer is:
C
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