A solenoid is 2.03 m long, has a radius of 0.810 cm, and has 600 turns. It carries a current I of 2.39 A. What is the magnitude of the magnetic field B inside the solenoid and far from either end?

c

explanation:

the answer is neither ball has a charge.

because if they were both positively charged, they will repel each other.

if they were positively and negatively charged, they will seek.

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.