This question was in my exam today :
A metallic and glass sphere of same size were dropped at same height. Which sphere would hit the ground first and why?
I have thought about several things and cannot come to conclusion. An emf will be developed as electrons will move due to earth's magnetic field. So we have a charged sphere? What now? Magnetic force will be perpendicular to velocity hence no work done by it.
If only someone could just point me in the right direction.