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A voltmeter is used to measure the poten...

A voltmeter is used to measure the potential difference `V` across `XY` in the circuit in Figure below
. In order to give an accurate reading `V`, how should the resistance of the voltmeter compare with `R` ?

A

Much greater than `R`

B

Slightly less than `R`

C

Equal to `R`

D

Slightly greater than `R`.

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