Examine the setup in front of you. you have gliders that are free to move on air tracks. you have two photogates that can be used to measure the speed of a glider that passes through the photogate. the photogate measures the time that elapses while a glider passes through. how can you determine the speed of the glider from the photogate measurement

The electric field between square plates of a parallel-plate capacitor has magnitude e. the potential across the plates is maintained with constant voltage by a battery as they are pulled apart to twice their original separation, which is small compared to the dimensions of the plates. the magnitude of the electric field between the plates is now equal to a)e b)e/4 c)e/2 d)4e e)2e