Ihave an exam tomorrow and just need to know the steps and equations to find the induced current in a coil because of the solenoid. i also someone to explain how to find the direction of the current. just keep it clear and not confusing.

The diagram shows four locations in the electric field of a positive point charge m. at which location is the electric potential the greatest.

Two identical stars with mass m orbit around their center of mass. each orbit is circular and has radius r, so that the two stars are always on opposite sides of the circle. (a) find the gravitational force of one star on the other. (b) find the orbital speed of each star and the period of the orbit. (c) how much energy would be required to separate the two stars to infinity?

During cooling, the kinetic energy of the molecules falls. why does this happen? a.the motion of the molecules increases. b. the motion of the molecules slows down. c.the van der waals forces between molecules decrease d. the forces of attraction between the molecules are overcome.