Question

If a load is suspended from a spring and a direct current is passed through it then the spring gets

• A. stretched
• B. compressed
• C. sometimes stretched and sometimes compressed
• D. neither stretched nor compressed

Answer 1

Answer: (B)

compressed

Two consecutive circles of the spiral shaped spring will attract each other when current is passed through it.
Hence, the spring will compress.
This force will be opposite to the weight of the spring and also in the same direction as the restoring force acting upward.