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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, a 10  20  30  c b

1. 1.0 A
2. 0.4 A
3. 0.6 A
4. 0.2 A

Correct answer: 0.4 A

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