A source is emitting EM waves in all directions equally. When you stand some distance from the source, you measure an intensity of EM waves at your location. How does the intensity you measure change if you move closer to the source so you are one-half of the original distance away from it

The electric potential v is constant everywhere within a certain region of space. which statement below is true? the choices are: the electric field is also constant (but not zero) within the region. a charged particle placed within the region will experience an electric force. the electric field is zero everywhere within the region. the electric field varies from place to place within the region.