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Question

A cell of negligible resistance and emf 2 volt is connected to a series combination of 2,3 and 5 ohm. The potential difference in volts between the terminals of 3-ohm resistance will be:

A
0.6volt
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B
23volt
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C
3volts
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D
6volts
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Solution

The correct option is C 0.6volt
In a serially connected circuit the voltage across is directly proportional to the resistance in the circuit. That is, VR.
So, VVtotal=RRtotal
The total resistance R in the circuit is R=2+3+5=10 ohm.
Since, the resistance of the 3 ohms resistor is only three tenth of the total resistance, the applied voltage is given as 310×2= 0.6 volt
Hence, the potential difference between the terminals of 3 ohm resistance will be 0.6 volt.

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