Question

7. An engineer is using a wire that has a resistance of 1.5 . This resistance is too high for the application he is designing. The wire must be exactly 2.5 cm long. What two things could he do to reduce the wire's resistance

Answer 1

Answer and Explanation:

We know that resistance $R=\frac{\rho l}{A}$  from the given equation of resistance it is clear that resistance depends on resistivity length  and area of the material but we can not change the length because it is given that the length must be 2.5 cm long.

So we can do two two things to reduce the resistance

1. increase the cross sectional area
2. decrease the resistivity of the material