Question

Two metallic wires A and B are connected in second wire A has length l and radius r, while wire B has length 2l and radius 2r. Find the ratio of total resistance of series combination and the resistance of wire A, if both wires are of same material?​

Answer 1

Answer:

Resistance of A

=rho*l*a

=rho*l*Π*r*r...ANSWER 2

Explanation:

Resistance of B

=rho*2*l*Π*2r*2r

so total R of A and B

=rho*l*Π*r*r*4

now we get ratio of resistances of (A+B) and A by dividing :

(rho*l*Π*r*r*4)/

(rho*l*Π*r*r)

=4......This is ANSWER 1