A material 'B' has twice the specific resistance of 'A'. A circular wire made of 'B' has twice the diameter of a wire made of 'A'. Then for the two wires to have the same resistance, the ratio lB/lA of their respective lengths must be [2006] - VgyanHub

Question:

A material ‘B’ has twice the specific resistance of ‘A’. A circular wire made of ‘B’ has twice the diameter of a wire made of ‘A’. Then for the two wires to have the same resistance, the ratio lB/lA of their respective lengths must be [2006]

Options :

a)1/2
b)1/4
c)2
d)1

Answer :

c)2

Answer Steps :

Step:-1

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