Figure shows a part of an electric circuit. The potentials at points a, b and c are 30 V, 12 V and 2 V respectively. The current through the 20 
resistor will be,
Text Solution
Verified by ExpertsThe correct answer is:
B
Let the potential be x V at the junction.
By using V = IR we get,
30 - x = 10i 1
x -12 = 20i 2
x - 2 = 30i 3
By using Kirchhoff s law,
i 1 =i 2 + i 3
The current through the 20 
resistor is
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