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Question
A long straight wire in the horizontal plane carries a current of 50 A in north to south direction. Give the magnitude and direction of B at a point 2.5 m east of the wire.
Solution
First, let's decide on the standard paper directions.
Magnitude of magnetic field,
`|vecB| = μ_0/(4pi) (2"I")/r`
= `10^-7 xx (2 xx 50)/2.5`
= 40 × 10-7 T
The direction of the magnetic field is upwards when one uses the right hand palm rule.
`vecB = 40 xx 10^-7 hatk`T
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