Induction: How Nearby Coils Generate Current

[Kavyesh Talwar]

why is current produced in a coil if it is placed near other current caarrying coil

 

[XZ923]

why is current produced in a coil if it is placed near other current caarrying coil

If a current is run through a coil, it will produce an electromagnetic field around the coil. If a different coil is placed inside that field, the electromagnetic field from the first will induce a current in the second.

 

[davenn]

If a current is run through a coil, it will produce an electromagnetic field around the coil. If a different coil is placed inside that field, the electromagnetic field from the first will induce a current in the second.

with the important point that the current in the first coil must be alternating ( oscillating)

ie. if it is a non varying DC current, there will be no induced voltage/current into the second coil

 

[Alphany Tz]

If a current is run through a coil, it will produce an electromagnetic field around the coil. If a different coil is placed inside that field, the electromagnetic field from the first will induce a current in the second.

He hasn't asked question clearly but he was mean that what happen if two coil both are supplied power placed near?

 

[Windadct]

Hello Alph and welcome.. sorry but your comment was not clear at all.

 

[davenn]

He hasn't asked question clearly but he was mean that what happen if two coil both are supplied power placed near?

that just doesn't make sense at all

 

[Kavyesh Talwar]

If a current is run through a coil, it will produce an electromagnetic field around the coil. If a different coil is placed inside that field, the electromagnetic field from the first will induce a current in the second.

why is current produced in a coil if it is placed near other current caarrying coil

but how actually is the current produced

 

[davenn]

but how actually is the current produced

have a read up on transformer theory ...

https://en.wikipedia.org/wiki/Transformer

 

[meBigGuy]

Here is a transformer thread. Two coils near each other ia essentially a transformer.

https://www.physicsforums.com/threa...-ideal-transformer.819580/page-2#post-5152002

 

[EverGreen1231]

why is current produced in a coil if it is placed near other current caarrying coil

See: Maxwell Equations. They'll give you the answer you want much more eloquently and clearly than I can.

 

[Windadct]

One of the benefits of this topic is that it can be broken down into smaller parts:

1) Current flow produces a magnetic field - even when you pass DC current though a conductor, or a wrapped coil of conductors, at the initial "turn on" the magnetic field is changing, once the DC current has reached steady state - the magnetic field is no longer changing - but is still there!

2) A changing magnetic field will induce a current in a conductor that intersects the conductor. This is induction -- if we move a conductor through a static (non-changing ) field we induce current. (permanent magnet generator with stationary magnets and moving windings) - if we hold a conductor stationary and move the magnet (field), current is also induced.

Commonly described as when magnetic flux lines* cut through a conductor current is induced. ( the purists here will be offended by the notion of magnetic flux lines - however that is the common introduction - they are not truly lines - the Mag Field is continuous, personally I suppose this notion comes from studying magnetic with iron filings - when you do this you see lines - but I digress... )

So in general we look at (study) creating magnetic fields - with magnets or with electromagnets-- once the field is established it does not matter HOW it is created.

OK - now take a conductor or coil (coil A), and turn the current on and off... you can understand you are creating and stopping a magnetic field. If you reverse the current the magnetic field is also reversed.

Now put another conductor or coil (coil B) - in the area of Coil A above (physical alignment of the conductors or coils does matter )... as the magnetic flux from coil A is not expanding and collapsing -- it is intersecting whit the Conductors in Coil B, this magnetic field induces current in Coil B.