Aparallel plate capacitor is connected to a battery. explain how the following physical quantities will change if the separation between the plates is halved? (a) voltage across the capacitor
(b) charge on each plate
(c) charge density on each plate
(d) electric field inside the capacitor

Which graph best represents the relationship between the electric current and the rate at which a magnet is turning inside an electric generator?

Red light strikes a metal surface and electrons are ejected. if violet light is now used with a 10% greater intensity, what will happen to the ejection rate (number of ejected electrons per second) and the maximum energy of the electrons? a) greater ejection rate; same maximum energyb) same ejection rate; greater maximum energyc) greater ejection rate; greater maximum energyd) same ejection rate; same maximum energye) none of the above answers are correct

Ahot-air balloon takes off from the ground traveling vertically with a constant upward acceleration of magnitude g/4. after time interval δt, a crew member releases a ballast sandbag from the basket attached to the balloon. how many seconds does it take the sandbag to reach the ground? (express your answer in terms of δt)