An object is hung using a metal spring.If now a current is passed through the spring,what will happen to this system?
A)The spring will contract,raising the weight.
B)The spring will extend,lowering the weight.
C)The weight will not move.
D)The spring will begin to swing like a pendulum.
E)None of these are true.

Question

Quizplus · Accepted Answer

When a current is passed through the spring, it heats up due to the resistance of the metal. This causes the metal to expand slightly. However, the dominant effect in this scenario is the electromagnetic force generated by the current flowing through the spring. This force causes the coils of the spring to contract, effectively shortening the spring and raising the weight attached to it.

An Object Is Hung Using a Metal Spring