Question

if the resistance of wire A is four times resistance of wire B then ratio of radii of two wire is what

Answer 1

rA = 4rB

L/ar(A) = 4{L/ar(B)}

If the length is same

then 1/ar(A) = 4/ar(B)

ar = πr^2

So, 1/πr^2(A) = 4/πr^2(B)

after cutting

r(B)/r(A) = 4/1

Hope it helps......

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