If the radius of a wire becomes half then its resistance
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R= rho×l/A
A- area
l- length
Resistance-R
Rho- resistivity
R= rho×l/ πr²
R=rho×l×4 / π
it means 4 times resistance
A- area
l- length
Resistance-R
Rho- resistivity
R= rho×l/ πr²
R=rho×l×4 / π
it means 4 times resistance
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