# A long straight wire carries a (+) current of two amps in a direction

1. Mar 17, 2004

### athenaroa

A long straight wire carries a (+) current of two amps in a direction 30 deg W of N. At apoint 0.5 m from the wire( in a direction 60 deg S of W) the magnetic field that it creates has size of how many Tesla.

2. Mar 17, 2004

### Chen

The magnetic field that an "inifite" current-carrying wire creates is:

$$B = \frac{\mu_0I}{2\pi r}$$

$$I$$ being the current that it carries, $$r$$ being the distance from the wire and $$\mu_0 = 4\pi * {10}^{-7}$$

3. Mar 18, 2004

### HallsofIvy

Staff Emeritus
As Chen pointed out, the answer depends only on the distance, which you are given. The angles given are irrelevant.