How strong is a tesla and how strong is a newton?

- - "Tesla" is a unit for the strength of a magnetic field.

The Earth's magnetic field at the surface ... the one that makes

compasses work ... averages roughly 45 microteslas.

So 1 Tesla = somewhere around 20,000 times the magnitude

of Earth's magnetic field at the surface.

There's a smaller, more convenient unit, called the 'Gauss'.

1 Tesla = 10,000 Gauss. The Earth's magnetic field ranges

between 0.25 to 0.65 Gauss at various places on the surface.

- - Newton is a unit of force, equal to about 3.6 ounces.

1 pound of force is about 4.45 newtons.