Three identical point charges ( 2.0 nc are placed at the corners of an equilateral triangle with sides of 2.0-m length. if the electric potential is taken to be zero at infinity, what is the potential (in v at the midpoint of any one of the sides of the triangle?

Explain why electric current cannot exist if a current doesn't have a voltage source.

Alarge cruise ship of mass 7.00 ✕ 107 kg has a speed of 11.6 m/s at some instant. (a) what is the ship's kinetic energy at this time? (b) how much work is required to stop it? (give the work done on the ship. include the sign of the value in your answer.) (c) what is the magnitude of the constant force required to stop it as it undergoes a displacement of 3.00 km?

Using the free-body diagram, calculate the net force acting on the sled. is the sled in a state of dynamic equilibrium?