Question

a wire of certain length and radius has a resistance fo 4 ohm keeping its length intact if the radius of the wire is reduced to hall what will be the new resistance​

Answer 1

the new resistance will be increased because it is inversely proportional to resistance.

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Answer 2

Answer:

Better understand the concept rather than blind idea. Say old Resistance is R1. New resistance is R2.

Decrease in length would reduce the resistance proportionally. R1 will be half by length.

Radius affects by its square. Decrease in radius would increase the resistance. Being squared, resistance would increase by 4 as new radius is 1/2

R2= R1x4/2=2R1