if current is passed through spring then spring will ? (A)expand

(B) compress

(C)remain same

(D)non of these

Please,also mention reason behind it.

@ pranav 
when a current will pass through the spring the magnetic filed will produce since the current pass in same direction in all coil of spring , the magnetic field wil have same direction all coils . 
this causes the spring to reduce its length , 
so, compress ( option 2 ) turns out to be the correct answer . 
HOPE IT CLEARS ..

option B is correct. Because we can treat spring as solenoid  and when current passes through solenoid Magnetic field is produced on the axis of solenoid B = (μNi)/L 

.•. B is inversely proportional to Current .

Hence when current is passed through coil the magnetic field is produced hence length is reduced

 

   I hope it clears concept