Amoving bumper car hits the back bumper of a stationary bumper car. the momentum of the stationary car increases. which happens to the momentum of the moving bumper car?

-it decreases
-it stays the same
-it is converted to inertia

since you're a real machine, your ama is always less than your ima, because you can never totally eliminate friction.

the answer is the first electromagnet (a). this is because it has more coils around the ferromagnetic material. increasing the number of coils increases the surface area in which the metal interacts with the current in the coil. this enables more atoms in the metal to become aligned hence becoming more magnetized.