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42. If a current is passed in a spring, it[MP PMT/PET 1998; AIEEE 2002](a) Gets compressed(c) Oscillates(b) Gets expanded(d) Remains unchanged

Answer»

When acurrent is passed through a spring, a magnetic field is produced due to each coil of thespring.Thespringwill act like a solenoid and initially it will oppose the effect due tocurrent(inductor)but later magnetic field attracts the surrounding coils and hence thespring contractsas if it is compressed.



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