Which of the following affects the resistance of a wire?
I. The material from which it is made
II. The length of the wire
III. The diameter of the wire

I only

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II only

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I and II only

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I and III only

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I, II, and III

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Solution

The correct option is E I, II, and III
The expression of resistance of a wire is $R = \frac{ρ L}{A}$ where $ρ =$ resistivity of the material of the wire, $L =$ length of the wire and $A =$ cross sectional area of wire.
The resistivity is depends on the the material of wire of which it is made. So statement I is true.
The resistance is also depends on length $L$ and diameter because the area A comes from diameter.
Thus, all statements are correct.

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