Astudent wants you to demonstrate that an electric current will produce a magnetic field. which set of objects could be used to demonstrate this? a) a battery, a coil of wire and a compass. b) a compass, some paper clips and a battery. c) a battery, an iron nail and a long copper wire. d) an iron nail, a permanent magnet and a battery.

A

Explanation:

A compass can show that an electric field is present. So, a battery, a coil of wire and a compass together could demonstrate that an electric current produces a magnetic field.

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.