A conducting loop with area 0.15 m 2 and resistance 6.0 lies in the xy plane.

A conducting loop with area 0.15 m² and resistance 6.0 Ω lies in the x–y plane. A spatially uniform magnetic field points in the z-direction. The field varies with time according to B_z = at² - b, where a = 2.0 T/s² and b = 8.0 T. Find the loop current
(a) at t = 3.0 s
(b) when B_z = 0.