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Magnetism

Blazing goIITian

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8 Jan 2010 14:38:40 IST

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A current i enters a circular at a point at leaves at the opposite diametrically end point.If a char

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A current i enters a circular at a point at leaves at the opposite diametrically end point.If a charge q moves through the axis of the circular wire,through its centre, what is the magentic force experinced by it? (HCV pg 229)[The ans. given is zero,but didnt understand]

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Abhishek S

Blazing goIITian

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8 Jan 2010 14:39:16 IST

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Sorry..the radius of circular wire is "a"

Akash

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12 Jan 2010 17:44:14 IST

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since it is a circular wire and current leaves at the diametrically opposite end, current divides into equal parts in both semicircles. The magnetic field due to one is balanced by other, hence force on charge=0

Yagyadutt Mishra

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12 Jan 2010 17:59:52 IST

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See magnetic field by a current travelling in an arc with angle A....at a the center is equal to...

B = mu(I)(A) / 4pir where mu( is the constant)

if the current is enetering diametrically then equal amount will be distributed..and each will follow a semicircular path ...so A =pi///

Hence B for both the case will be B = mu(I) / 4r

Now but direction will be different for both case...

Current with anticlockwise direction will exert a upward force while the current with clockwise exert a downward force....on the charge..hence both will cancel each other....

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