If a length of a cylindrical conductor increased by 20% keeping the volume constant.then percentage change in resistance of the conductor is 11×n% the value of n
Sailaja , 6 Years ago
Grade 12
1 Answers
Arun
Last Activity: 6 Years ago
Dear student
as volume is constant
V1 = V2
A1 * L1 = A2 * L2
L2 / L1 = A 1 / A2 = 1.02
Now
R = rho * L /A
hence
R1 / R2 = L1 *A2/ L2 *A1
R1 / R2 = 1 / 1.02^2
R1 / R2 = 1 / 1.0404
R2 = 1.0404R1
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