Question

What will happen to the spring If I pass the current through it..... ? Please explain ........

Answer 1

spring will contract

Answer 2

NO WAY

Answer 3

Nothing will happen to the spring.

Answer 4

I thin it will act like a solenoid.

Answer 5

*think

Answer 6

when current is passed through spring it acts like a solenoid and initially it will oppose the effect due to current (inductor) but later due to strength of magnetic field spring contracts

Answer 7

WIll contract or no ? I got this view that the spring will experience a force if the magnetic field produced by the current reinforce any external magnetic field..... What do U say...... ? because there is no magnetic field

Answer 8

Ghazi, u r wrong. Lemme explain.

Answer 9

Assuming that the spring is insulated outside and is a conductor, it will act like a solenoid.Refer this if you want to know more about it: http://en.wikipedia.org/wiki/Solenoid

Answer 10

Give me 10 minutes.

Answer 11

@ghazi u are saying that the produced magnetic field due to current will overcome the opposition of the spring...... ?so the spring will contract..... RIght ?

Answer 12

Okay @rajathsbhat ..... I am waiting

Answer 13

right .... see my next comment how and what i want to say and @rajathsbhat i am 100% sure about my answer....see the next comment and read it carefully :)

Answer 14

The basic theory of solenoid valves and their operation is broken down into two components. The first lies in the solenoid coil, which is for all intents and purposes a metal spring. When an electrical current passes through the coil, it becomes an electromagnet and coils in on itself, pulling into a tighter space. The second part of basic solenoid valve theory is in the elastic diaphragm. It prevents fluid from passing because of the balance in fluid pressure between the input portion of the T and the output portion of the T. But when the solenoid coil contracts, it creates marginally more room and the fluid pressure in the output portion of the T decreases slightly. This causes the elastic diaphragm to pull back into the output portion, allowing fluid to pass through the two chambers freely. However, when the electrical current passing through the solenoid coil stops, the coil expands and pushes forward, equalizing the pressure between chambers and sealing them off from one another via the diaphragm. In this way, electromagnetism and fluid pressure become the basics behind the theory of solenoid valve structure and operation.

Answer 15

Assuming the spring isn't already in unstretched condition (i.e., there is some distance between adjacent turns) and is unconstrained, it shortens due to the mutual magnetic attraction between the turns.
The force between turns can easily be derived from the force between straight wires (ref.). F = μ0*I^2*L/(2πd), where μ0 is the magnetic permeability = 4pi*1E-7 N/A^2, I is current, L is "wire" length of one turn and d is the distance between turns. Since L = 2πr, where r is the radius of the coils, F = μ0*I^2r/d.

Answer 16

@mathavraj i guess it will be clear now...mutual magnetic attraction!!

Answer 17

@waleed_imtiaz hope it is clear now...

Answer 18

Now @gazhi don't copy and paste answers hoping to get more medals.
http://answers.yahoo.com/question/index?qid=20090322164348AARf8XT
Source where he copied his answer from.

Answer 19

i ain't copying i just wanted to make @rajathsbhat clear...i am here for discussion not for medals @kartiksriramk ....if you can't help ..then better not to make any unfavorable comment..please!!

Answer 20

@kartiksriramk i knew these answers ..but it would have taken time to write these stuff so i just brought content over here to save time....

Answer 21

i will research this thoroughly & perform the experiment myself before posting anything. But my initial suspicion is that ghazi is right....

Answer 22

@ghazi so u are saying that when current will pass through the spring , it will act like an electromagnet and it will coil around itself.......So, it will contract...... RIght ? If this is true then Em okay...... with ur answer.......

Answer 23

yes...@waleed_imtiaz it will contract and the detailed reasoning is in front of you :)

Answer 24

OKay Fine......... Thanks

Answer 25

welcome :)

Answer 26

@mathavraj sorry dude..by mistake i mentioned your name... my apology :)