A short, straight wire segment of length l carries current I and is oriented so that it makes an angle of 30° with the horizontal. Point P is a distance r below the wire segment.
Which expression below is the best approximation for the magnetic field caused by the wire segment at point P?
(a) (μoIlcos30°) / (4π2)
(b) (μoIlsin30°) / (4π2)
(c) (μoIl) / (4π2)
int[B dot dl]= miu I
The Attempt at a Solution
I used formula above, I take path as 2 pi l and it is wrong , answer is A