Why does a car slide when it rolls over an icy patch on a road?

1. cars have more momentum on icy surfaces.
2. there is less friction between the car tires and the ice than between the car tires and the road.
3. there is more friction between the car tires and the ice than between the car tires and the road.
4. cars have less momentum on icy surfaces.

rewarded with 15 pts

Electromagnetic induction. a coil of wire contains n turns and has an electrical resistance r. the radius of each turn is a. initially, inside the coil there exists a uniform magnetic field of magnitude b0 parallel to the axis of the coil. the magnetic field is then reduced slowly. the current induced in the coil is i. how long does it take for the magnitude of the uniform field to drop to zero?