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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.

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.

Grade:12th pass

2 Answers

Umakant biswal
5349 Points
6 years ago
@ 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 ..
Aman
15 Points
3 years ago
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

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