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Magnetism

Cool goIITian

Joined:	3 Nov 2006
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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^)/2

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??

Comments (4)

Purav Master

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28 Aug 2007 09:52:17 IST

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For your second ques.,

Simply Use the right hand thumb rule to determine the direction of magnetic force.........

Purav Master

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28 Aug 2007 14:03:55 IST

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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.

Krishna Gopal Singh

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

pamidi vishnu

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Joined: 15 Aug 2007

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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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