Our physics expert picks his top-five equations, plus a scheme to supply US power needs with a bucket of baseballs. Thanks, ...

When an electric current flows, the shape of the magnetic field is very similar to the field of a bar magnet. The field inside a solenoid is strong and uniform. The small magnetic field caused by ...

If these metals have not been turned into a permanent magnet they will still be attracted to a magnet if placed within a magnetic field. In this situation they act as a magnet - but only whilst in ...

Some of the most sensitive methods of measuring magnetic fields use interactions of resonant ... is given by the product of three quantities in equation (1), the magnetic moment of the atoms ...

The difference or "missing mass" is converted into energy in accordance with Einstein’s equation ... Magnetic confinement fusion Magnetic confinement fusion is based on the fact that ions and ...

Observing the effects of special relativity doesn't necessarily require objects moving at a significant fraction of the speed ...

But it was way better. The reason why these predictions were off was that the equations did not take into account the magnetic fields. “We found that certain ratios of the cut’s width and ...

In physics, symmetry provides an important ... This is because the equations describing the magnetic field are symmetric with respect to the operation of swapping the N and S poles.

As well as a few temporary reversals, the Earth's magnetic field – just like the Sun – can flip over long timescales. During the Brunhes–Matuyama reversal, the magnetic north could have been ...