PLEASE EXPLAIN ALL PARTS IN DETAIL!!! VERY CONFUSED The wire shown at the right

Question

PLEASE EXPLAIN ALL PARTS IN DETAIL!!! VERY CONFUSED

The wire shown at the right carries a current of 4A. The segment of the wire from A to B is 40cm long. Consider the magnetic field at the point P a distance 20cm above the center of the wire. Only the segment of the wire from A to B contributes to the field.

(a)Compute the magnetic field using the infinite straight wire approximation.

(b)Compute the magnetic field at point P approximating the segment A to B with one segment.

(c)Approximate the magnetic field at point P using two segments that divide the wire in half. Draw the displacement vector from the center of segments to the point P.

Explanation / Answer

part A :

magnetic field B = Uo I /(2 Pi r)

B = ( 2 e-7 * 4).0.2

B = 4 uT

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part B :

B = ( uo I /4 pi r) *(sin 30+ cos 30)

B = 2 uT

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part C:

B = uoI/4piR ( sin 30 + sin 0)

B = 1uT

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part D:

Bnet = .2 uT

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