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//example-18.4
//page no-547
//given
//resistance of wire
R=21 //ohm
//length of wire
l=200 //m
//diameter of wire
d=0.44*10^-3 //m
//area of cross section of wire
A=(%pi)/4*d^2 //m^2
//as we know that
//R=rho*l/A
//so
rho=R*A/l //ohm m
printf ("the specific resistance of wire is %e ohm m",rho)
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