The potential difference across the ends of a wire is doubled in magnitude.If Ohm's law is obeyed,which one of the following statements concerning the resistance of the wire is true?
A)The resistance is one half of its original value.
B)The resistance is twice its original value.
C)The resistance is not changed.
D)The resistance increases by a factor of four.
E)The resistance decreases by a factor of four.

Question

Quizplus · Accepted Answer

Ohm's law states that the potential difference across a conductor is directly proportional to the current flowing through it, provided the temperature and other physical conditions remain constant. Therefore, if the potential difference across the ends of a wire is doubled, and the wire follows Ohm's law, then the current flowing through it will also double. If the current doubles, and the voltage doubles, the resistance of the wire must stay constant (R = V/I). Hence, option C is correct.

The Potential Difference Across the Ends of a Wire Is