A wire 5.0 m long and 3.0 mm in diameter has a resistance of 100 . A

A wire 5.0 m long and 3.0 mm in diameter has a resistance of 100 Ω. A 15-V potential difference is applied across the wire. Find
(a) The current in the wire,
(b) The resistivity of its material, and
(c) The rate at which heat is being produced in the wire.