Question

The smallest magnet available is ___________.

• A. a bar magnet with an area of $1m{m}^2$
• B. a spinning electron
• C. a magnetic dipole
• D. a molecule or atom with a magnetic dipole

Answer 1

The correct option is B a spinning electron

An electron is not a spinning ball of charge and the intrinsic spin of particles cannot be understood in such terms. a value of the ratio between the magnetic moment and the angular momentum that is a factor 2 too small.

The smallest magnet available is a spining electron.