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A cell of internal resistance is connect...

A cell of internal resistance is connected across a resistor. A voltemeter having varible resistance `G` is used to meausre p.d. across resistor. The plot of voltmeter reading `V` against `G` is shown. What is value of external resitor `R`

A

`5 Omega`

B

`4 Omega`

C

`3 Omega`

D

`1 Omega`

Text Solution

Verified by Experts

The correct Answer is:
A
(a) When `g = oo, V = 20 V` and no current will pass through voltmeter.
`I = (4)/(1) = 4 A R = (20)/(I) = (20)/(4) = 5 Omega`
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