This question is about magnetic FieldsIm quite stuck on this questions, here it is:We have a horizontal copper bar of 25mm by 25mm square cross section and length l carrying a current of 65A.Calculate the minimum value of the flux density of the Field if its weight is to be supported by the force that acts upon it. Density of copper: 8.9x10^3 kgm^-3I don‘t understand how we can get this using the density. Please if someone could help?
The density times the crossectional area gives the mass per unit lenght. Multiply by g to the the weight per unit length. The external magnetic field produces a force per unit length on the current carrying conductor that opposes its weight. You need to find the strength of external field needed to support the weight of the copper.
