Unfortunately it is not possible to measure the magnetic force being experienced by the electromagnetic wire directly. However, by applying Newton’s 1st Law to the system of this experiment, it does become possible to find an experimentally viable equation for Bext. Write the equation you will be using to find Bext.

= (mg / Lr) (d / I)

where m is mass, L is length of wire, r is radius, d is displacement, I is current

Explanation:

think its the third option

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.