The current that passes through 20 ohm resistance when it is connected in parallel with a 30 ohm resistance and this set is connected to a battery of 2V is
A
0.2A
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B
0.3A
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C
0.1A
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D
0.016A
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Solution
The correct option is D 0.1A The situation is shown in the figure. The total resistance in the circuit is 12ohm. So the total current flowing through the circuit is I=2/12=1/6A. Let the current passing through the 20 ohm resistance be i1 and that through the 30 ohm resistance be i2. Thus we get: i=i1+i2 and 20i1=30i2 Thus we get: i1+23i1=16 or i1=0.1A