Q40 of 126 Page 198

What should be the value of R in figure for which the current in it is zero.


Any value of R

This is an example of balanced Wheatstone bridge.


In such a setup, the current through the middle branch is zero irrespective of the resistance. Hence, any value R would suffice for current to be zero.


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Find the current through the 10Ω resistor shown in figure.


 39

Find the current in the three resistors shown in figure.


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Find the equivalent resistance of the circuits shown in figure between the points a and b. Each resistor has a resistance r.


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Find the current measured by the ammeter in the circuit shown in figure.