Ohm's law: When a potential difference of 10 V is placed across a certain solid cylindrical resistor, the current through it is 2 A. If the diameter of this resistor is now tripled, the current will be

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Ohm's law states that V = IR, where V is voltage, I is current, and R is resistance. Resistance R is inversely proportional to the cross-sectional area A of the resistor. If the diameter is tripled, the area increases by a factor of 9 (since area is proportional to the square of the diameter). Thus, the resistance decreases by a factor of 9, and the current increases by a factor of 9, resulting in a current of 18 A.

Ohm's Law: When a Potential Difference of 10 V Is