Answer:

Explanation:
You need to be careful with units for this problem. The force will be:



1) Magnetic field
2) Electric current
3) Force
Answer:
For C is B and for D is A
Explanation:
B because that's where the b car will do all the force to go up, and A because there the car doesn't have to do any force other than the natural, and it already brings that on it's own.