PLEASE HELP WITH THIS ONE QUESTION Which of the following must be true for a current to be induced in a wire passing through a magnetic field?

A) the magnetic field and the direction of motion must be perpendicular

B) the magnetic field and direction of motion must be parallel

Four objects each with charge +2.0×10−7c are located at the corners of a square whose sides are 2.0 m long. part a what quantities can be determined using this information? check all that apply. the electric force on a charged object placed at the center of the square. the mass of each object. the total electric potential energy of the system consisting of the four charged objects. part b find the electric force on a charged object placed at the center of the square.