- #1

Cazicami

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## Homework Statement

A steady current of 1A flows down an infinitely long straight cylindrical wire of radius r=5mm

Explain in what direction the magnetic field is pointing outside the wire

## Homework Equations

The Biot Savart law - B = 4∏/μ ∫∫∫ ((Jdv) x r)/r

^{2}

Sorry for the poor equation

## The Attempt at a Solution

I would have said the magnetic field would point radially around the wire.

However the solutions say: From the Biot-Savart law follows that the magnetic field has to point in azimuthal direction. The radial component is zero.

I have tried googling azimuthal as I have no idea what it means, and it seems to mean an angle away from horizontal, but if anyone could clear up what the answer is, or direct me to something that would help that would be great.

Thanks