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A current 10A is flowing East to West in...

A current 10A is flowing East to West in a long wire kept horizontally in the East - West direction. Find the magnitude and direction of magnetic field in a horizontal plane at a distance of 10 cm North.

Text Solution

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Given:
Current , I = 10 A (East to West)
Distance, r ` = 10 cm = 10 xx 10^(-2)` m
Magnetic field , `|B| ` = ?

The magnitude of magnetic field for the infinite length of the wire , `|B| " is " = (mu_(0)I)/(2 pi r) `
`|B| = (4 pi xx 10^(-7) xx 10)/(2 xx pi xx 10 xx 10^(-2)) = 2 xx 10^(-5) T`
The direction of magnetic field is given by right hand thumb rule or maxwell's cork screw rule .
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