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Potentiometer wire length is 10m, having...

Potentiometer wire length is 10m, having a total resistance of `10Omega`, if a battery of emf 2 volt negligible internal resistance and a rheostat is connected to it then potential gradient is 20mV/m find the resistance applied through rheostat:-

A

`90Omega`

B

`990Omega`

C

`40Omega`

D

`190Omega`

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