Question

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.​

Answer 1

A. It will increase

Step-by-step 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.