A piece of wire is redrawn so that it's radius is halfed without change in it's volume. Compare new resistance with old resistance.
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Radius is half
The new cross sectional area= pi x radius²= pi x (R/2)²
or (pi/4)x R²
So 4 /(1/4) equals 16.
The new resistance is 16 times the original resistance.
The new cross sectional area= pi x radius²= pi x (R/2)²
or (pi/4)x R²
So 4 /(1/4) equals 16.
The new resistance is 16 times the original resistance.
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