# What will be the reaction for current flowing in a wire ?

1. Jul 10, 2010

### MalliCk

Although some might think that this Q of mine is an inclination towards amateurism

but yet this is what i want to know :)

if every action has an equal and opposite reaction, then what will be the reaction for current flowing in a wire ?

2. Jul 10, 2010

### Staff: Mentor

Re: Reaction

When Newton's 3rd law talks about 'action/reaction' it is referring to forces between bodies. If body A exerts a force on body B, then body B exerts an equal and opposite force on body A. One of those forces is the 'action'; the other is the 'reaction'. (It doesn't matter which is which.)

'Action/reaction' is sort of old fashioned terminology. Nowadays we speak of '3rd law pairs'.

3. Jul 10, 2010

### Astronuc

Staff Emeritus
Re: Reaction

There is resistance to current flow. The EMF forces the charges (electrons) to flow, and the 'resistance' opposed the current.

4. Jul 10, 2010

### dlgoff

Re: Reaction

Big transformers in substations are designed for the turns to move as a reaction from the large magnetic fields produced by the surge current when switching in a big load.

5. Jul 10, 2010

### MalliCk

Re: Reaction

Well i totally have consent to your post, but Mr. Newton proposed that the reaction should be equvalent to the action.
Thats what giving me a thought, the equivalence to the flow?
Which i could not think of?

Probably i could find some one ellaborating that

6. Jul 20, 2010

### MalliCk

Re: Reaction

so whats up

any one here can solve the issue!!

7. Jul 22, 2010

### Zryn

Re: Reaction

Current flowing in a wire is the 'reaction' to a potential difference 'action' between two points.

Point A has a surplus of charge, and Point B has a deficit of charge, hence there is a difference in the potential energy. Current, otherwise known as dQ/dt or the movement of charge over a period of time, is a description of how the charged particles move from A to B, limited only in magnitude by the resistance of the medium.

Reading into Conservation of energy, Ohm's Law and Kirchhoff Voltage/Current Laws should give you answers also.

8. Jul 27, 2010

### MalliCk

Re: Reaction

well every thing work alright uptill it is in concern to opposition, but i cant work out about the equivalence of the two pair???

confused !