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

Explanation

According to formula, magnetic field produced at point P is,
`B=(mu_(0)I)/(2pir)`
`thereforeB=((4pixx10^(-7))(50))/((2pi)(2.5))`
`thereforeB=4xx10^(-6)T`
(Perpendicularly outward from point P or vertically upward) (according to right hand thumb rule).