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An electrical circuit is shown in figure.Calculate the potential difference across the resistor of 400 ohm,as will be measured by the voltmeter V of resistance 400 ohm,either by applying Kirchoff`s rules or otherwise.

An electrical circuit is shown in figure.Calculate the potential difference across the resistor of 400 ohm,as will be measured by the voltmeter V of resistance 400 ohm,either by applying Kirchoff`s rules or otherwise.

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Grade:12th pass

1 Answers

Adarsh
763 Points
3 years ago
this circuit actually forms a wheatstone bridge ,
the resistance of 400ohm and the internal resistance of voltmeter are in parallel their equivalent resistance will be 200ohm. And then we will get a balanced wheatstone bridge , and through a 100ohm resistance below 400ohm resistance current will not flow. 
then we get 2 loop through which current flows , current in loop is equal to 1/30 ampere . and by applying ohm,s law we will get the potential difference of 20/3 v across the 200 ohm resistance ..
hence, potential difference across 400ohm resistance is 20/3ohm.
 

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