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In the given circuit the internal resist...

In the given circuit the internal resistance of the 18 V cell is negligible. If `R_(1)=400 Omega` and the reading of an ideal voltmeter across `R_(4)` is 5V, then the value of `R_(2)` will be :

A

`300 Omega`

B

`450 Omega`

C

`550 Omega`

D

`230 Omega`

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