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In the given circuit reading of ideal voltmeter inE/2 then internal resistance of cell is

In the given circuit reading of ideal voltmeter inE/2 then internal resistance of cell is

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Grade:12th pass

1 Answers

Sandesh
34 Points
2 years ago
There will be no current flow in the ideal voltmeter. Current in the main circuit is 2E/(3+r). Potential difference across the voltmeter is -(i*r) + (E) = -2Er/(3+r) +E = E/2. {given in question}
       Since along current flow potential decreases, thats why negative sign for i*r.

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