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Question

A 2 volt battery, a 15Ω resistor and a potentiometer of 100 cm length, all are connected in series. If the resistance of potentiometer wire is 5Ω, then the potential gradient of the potentiometer wire is

A
0.005 V/cm
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B
0.05 V/cm
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C
0.02 V/cm
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D
0.2 V/cm
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