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## Homework Statement

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)

(a) (μoIlcos30°) / (4π2)

(b) (μoIlsin30°) / (4π2)

(c) (μoIl) / (4π2)

Answer:A

http://i.imgur.com/pEYlf.png

## Homework Equations

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