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7 February, 09:44

If the cross-sectional area of a wire is decreased while all other factors remain the same, how will the resistance change?

A. It will increase

B. It will decrease.

C. It will go to zero.

D. The cross-sectional area does not affect the resistance.

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Answers (1)
  1. 7 February, 11:45
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    A. It will increase

    Explanation:

    Area of a wire is:

    R = ρL/A

    where ρ is the resistivity of the wire,

    L is the length of the wire,

    and A is the cross-sectional area.

    If A decreases, while ρ and L stay the same, then R will increase.
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