Adiscmagnet is used to hold apiece of paper (0.1mmthick) to thedoorofa refrigerator.Themagnetis5cmindiameterand0.5 cmthick. Its mass is 100grams. Assuming thatthe coefficientoffrictionbetweenthepaper andthe refrigeratoris0.3, whatisthe minimum remanent magnetism (in Gauss) that themagnet must have in order tokeep the magnetandpaper from falling ?
