How strong is the magnetic field at a given distance from the magnet?
Elementary physics states that the magnetic field of a magnetic dipole is approximately proportional to the inverse square of the distance from the dipole. Therefore, if you double the distance from the magnet, the magnetic field strength will be reduced (roughly) by a factor of 4. • How are magnetic fields measured? The strength of a magnetic field is measured in units of Gauss (G), or alternatively, in Tesla (T). In the MKS (metric) system of units, 1 T = 1 kilogram*ampere/second^2 = 10^4 G. For comparison, the magnetic field of the earth at the surface is on the order of 1 Gauss, where that of a Neodymium magnet is on the order of 10^4 Gauss. This means that Neodymium magnets produce magnetic fields tens of thousands of times stronger than those of the earth! Technically, Gauss and Tesla are units of magnetic induction, also known as magnetic flux density. (This term is described in an earlier question.) Quantitatively, the force on a charged particle q moving with velocity v is giv
Elementary physics states that the magnetic field of a magnetic dipole is approximately proportional to the inverse cube of the distance from the dipole. Therefore, if you double the distance from the magnet, the magnetic field strength will be reduced (roughly) by a factor of 8. • How are magnetic fields measured? The strength of a magnetic field is measured in units of Gauss (G), or alternatively, in Tesla (T). In the MKS (metric) system of units, 1 T = 1 kilogram*ampere/second^2 = 10^4 G. For comparison, the magnetic field of the earth at the surface is on the order of 1 Gauss, where that of a Neodymium magnet is on the order of 10^4 Gauss. This means that Neodymium magnets produce magnetic fields tens of thousands of times stronger than those of the earth! Technically, Gauss and Tesla are units of magnetic induction, also known as magnetic flux density. (This term is described in an earlier question.) Quantitatively, the force on a charged particle q moving with velocity v is given
