Aproton is a subatomic particle that carries a charge

For which pair of objects would adding the same a

There are two-speed cameras, one in an are where the speed limit is 30 km/h and another where the speed limit is 50 km/h. in which will there be a smaller time interval between the photographs? explain your answer.

Amagnetic field applies forces on: a)static chargesb)moving chargesc)water flow