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10 Apr 2007 18:25:49 IST

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Electric field around current carrying conductor!

None

Sir please explain,

Why a current carrying conductor does not produce electric field around it whereas a stream of electrons (or protons) produces electric field???

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HEMANT BHARDWAJ

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10 Apr 2007 18:29:35 IST

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this is bcoz net charge in a current carring wire is always zero and only a charged thing can produce electric field

CyBorG

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10 Apr 2007 18:36:33 IST

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Thanx Indian army.I think u r right.I didnt think in that way.

HEMANT BHARDWAJ

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10 Apr 2007 18:41:06 IST

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kab yaar plz rate me i have not got any rate yet

HEMANT BHARDWAJ

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10 Apr 2007 18:42:05 IST

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oh ok i think u have given me thanx

Siddharth Agarwal

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10 Apr 2007 19:30:06 IST

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Something for general knowledge:

Electric and magnetic fields are actually one and the same. Whether they appear as an electric or a magnetic field, or a combination of both depends on the frame of reference.

If you place a moving charge near a current-carrying wire, the charge will experience a force. But what if you look at it from the frame of reference of the charge? The charge should not experience a force then (v=0). But actually it does.

The reason is that due to relativistic contraction, the charge distribution in the wire is uneven (when viewed wrt the moving charge). This causes an electric field to generate. This electric field moves the charge.

It has been proved mathematically that the answer comes out to be the same.

HEMANT BHARDWAJ

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10 Apr 2007 21:19:32 IST

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i am not agree with you sidlol bcoz if we fix the frame of referance with moving charge then its true that charge will come to rest but then the wire will be assumed to moving with equal speed =v

Siddharth Agarwal

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10 Apr 2007 21:25:54 IST

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So? The movement of the wire does not make a difference. Why will the magnetic field change with the movement?

In any case F=qvB, where v is the velocity of the charged particle. This velocity is NOT with respect to the source of the field.

HEMANT BHARDWAJ

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10 Apr 2007 21:33:24 IST

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dear sidol listen in the formula F=qVB the velocity is actualy relative velocity
think if this is not relative velocity but actual velocity then that will mean that every charge will experience a force bcoz actualy everything in universe is moving a charge(in rest) at earth is moving around sun our solar system is moving around the centre of our galaxy our galaxy is moving around centre of universe then how a charge can be at rest? if any charge is not at rest then according to u all charges shouid experience force even if their relative velocity is zero but that"s not true

Siddharth Agarwal

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10 Apr 2007 21:47:53 IST

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Don't believe me? Einstein agrees with me.

Also, check out the solution to the Irodov problem you posted.

edison

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12 Apr 2007 14:21:54 IST

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Yes the answer given above is perfect.

It is because the net charge in a current carring wire is always zero and only a charged thing can produce electric field

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