Physics WPH11: Electric and Magnetic Fields Topical Past Paper Questions

In the Bohr model of a hydrogen atom, an electron moves in a circular orbit around a proton. (a) A particle orbits a point O, in a circular path of radius r, as shown. The particle moves at a constant speed v. The dots represent two positions, an angle $ \theta $ apart. The accel…

In desert areas of California, solar panels use sunlight to generate electrical power. If sand collects on the solar panels, their efficiency is reduced. To remove sand, a positive electric charge is given to the sand particles and a negatively charged plate is moved across the p…

The diagram shows the Earth and some gravitational equipotential surfaces X, Y and Z. The difference in gravitational potential between X and Y is the same as the difference in gravitational potential between Y and Z. Explain why the equipotential surfaces are not equally spaced.