Q36 of 126 Page 198

Find the potential difference Va – Vb in the circuits shown in figure.


There are two current loops,


KVL in loop 1 gives



—————(1)


And in loop 2,



—————(2)


Solving (1) and (2)




Now,



B On rotating the figure we find that this circuit is similar to A


hence,


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34

Figure shows a part of an electric circuit. The potentials at the points a, b and c are 30 V, 12 V and 2 V respectively. Find the currents through the three resistors.


 35

Each of the resistors shown in figure has a resistance of 10 Ω and each of the batteries has an emf of 10 V. Find the currents through the resistors a and b in the two circuits.


 37

In the circuit shown in figure ϵ1 = 3V, ϵ2 = 2V, ϵ3 = 1V and r1 = r2 = r3 = 1Ω. Find the potential difference between the points A and B and the current through each branch.


 38

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