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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, R_3 = 100 Omega` and `R_(4) = 500 Omega` and the reading of an ideal voltmeter across `R_4` is 5 V, then the value of `R_2` (in `Omega` will be _____.

Text Solution

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The correct Answer is:
300
`R_(3)=100 and R_(4)=500Omega`
`V_(4)` (Reading of an ideal voltmeter across `R_(4)`) = 5V
Now `V_(3)` (Voltage across `R_(3)`) = 1V And `V_(2)` (voltage across `R_(2)`) = 6V
As `V_(2)=V_(3)+V_(4)`
Voltage across `R_(1)=12V`
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