When an electric current passes through a coil of wire instead of a single straight piece of wire, what is the result?
A. A stronger magnetic field
B. A weaker electric field
C. A weaker magnetic field
D. A stronger electric field

What object a collides with object b and bounces back its final momentum is?

Two steel balls, each of mass m, are welded to a light rod of length l and negligible mass and are initially at rest on a smooth horizontal surface. a horizontal force of magnitude f is suddenly applied to the rod as shown. determine (a) the instantaneous acceleration a of the mass center g and (b) the corresponding rate at which the angular velocity of the assembly about g is changing with time.

What ia the energy of an object because of its potential and kinetic energies