At what distance from a 0.100 C charge will the electric field be 10000 N/C? (unit:m)

Consider a system with two masses that are moving away from each other. why will the kinetic energy differ if the frame of reference is a stationary observer or one of the masses?

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

Which statement correctly describes the interaction between magnetic poles? north and south poles attract each other. north and south poles repel each other. two north poles will attract each other. two south poles will attract each other.