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[" A copper wire of length "ell" and rad...

[" A copper wire of length "ell" and radius "r" is nickel plated till its "],[" final radius is "2r." If the resistivities of the copper and nickel "],[" are "rho_(C)" and "rho_(N)," then the equivalent resistance of wire is: "],[[" (1) ",(rho_(c)ell)/(pi r^(2))],[" (3) ",(ell)/(pi r^(2))],[" (4) ",(ell)/(pi r^(2))(rho_(c)+(rho_(N))/(3))],[" (4) ",(ell)/(pi r^(2))(rho_(c)+(rho_(N))/(3))]]

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