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The graph of the potential difference V against the current I for a device is as shown below Which of the following is the correct deduction

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The resistance of the device remains constant when the p.d. increases

The resistance of the device remains constant when the current increases

The resistance of the device increases when the current increases

The device obeys Ohm’s law

answer is B.

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Detailed Solution

Slope of the V - I graph gives the resistance. So resistance increases

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