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Magnetism

Cool goIITian

 Joined: 3 Nov 2006 Post: 88
28 Aug 2007 09:49:12 IST
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magnetic field
Engineering Entrance , Medical Entrance , AIPMT , JEE Main , AIIMS , JEE Advanced , Physics , Magnetism

1.same current iis flowing in three infinitely long wires along positive x,y,z   directions. the magnetic field at a point (0,0,a) would be what??
the ans is i(j^ -i^)/2a.

i dont understand how it is j^ -i^ .

2.an electreon is moving along positive x axis.a uniform electric field exists towards the negative y axis. what should be the direction of magnetic field of suitable magnitude so that the net force on the electron is zero??
ans: negative z axis.

how??

Blazing goIITian

Joined: 9 Nov 2006
Posts: 814
28 Aug 2007 09:52:17 IST
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Simply Use the right hand thumb rule to determine the direction of magnetic force.........

Blazing goIITian

Joined: 9 Nov 2006
Posts: 814
28 Aug 2007 14:03:55 IST
1 people liked this

Consider this

Use Right Hand Thumb Rule.

Hold your fist in "thumbs-up" position. The direction of the thumb is the direction of current. The curls of your finger indicate the direction of magnetic field.

Forum Expert
Joined: 29 Dec 2006
Posts: 5524
11 Sep 2007 01:24:51 IST
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One question at a time. For first question your doubt is right gayatri. It should be i^-j^. This answer is wrong

New kid on the Block

Joined: 15 Aug 2007
Posts: 6
11 Sep 2007 14:59:47 IST
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electron is moving along x axis and electric field direction is along negative y direction,so that electron will expierience force in the negative y direction,if u apply fleming's right hand thumb rule such that magnetic field direction(fore finger )is along negative z direction,then force due to magnetic field is along positive y direction.then net force will be zero.

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