A cylindrical conductor has resistance of R0 = 140 Ω. It has length L, radius of the cross section r, and resistivity ρ.  Part (a)  Express the resistance in terms of L, r, ρ.  Part (b)  If the resistivity increases by a factor of 5, what would the value of the new resistance be, in ohms?  Part (c)  If the resistivity was restored to its original value and instead the length of the conductor decreased by a factor of 5, what would the value of the new resistance be, in ohms?   Part (d)  If the resistivity and length of the conductor were at their original values and the radius of the conductor increased by a factor of 4, what would be the value of the new resistance, in ohms?

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