Question

out of the two wires P and Q shown below ,which one has greater resistance?justify it​

Answer 1

answer is Q because area is inversely proportional to resistance so less the resistance more the area...

Answer 2

Given,

Two wires P and Q.

To find,

Which wire has greater resistance?

Solution,

• The resistance of a wire is inversely proportional to the area of the cross-section.

• Resistance of wire is calculated by R=p(l/A), where p is resistivity constant, l is the length of the conductor and A is the area of conductor

• The higher the resistance of the wire smaller is the area of the wire.

• Wire P has an area of cross-section A, while wire Q has an area of cross-section as A/2 hence the wire Q has higher resistance than wire P.

Therefore Q has greater resistance.