Four wires of the same diameter are connected, in turn, between two points maintained at a constant potential difference. Their resistivity's and lengths are; ρ and L (wire 1), 1.2 ρ and 1.2L (wire 2), 0.9ρ and 0.9L (wire 3) and ρ and 1.5L (wire 4). Rank the wires according to the rates at which energy is dissipated as heat, greatest first.

4>1>2>3

Heat dissipated is directly proportional to resistance. And resistance is directly proportional to the product of \(\rho\) and L.