Q. Four identical charges, +Q, occupy the corners of a square with sides of length a. A fifth charge, q, can be placed at any desired location. Find the loction of the fifth charge, and the value of q, such that the net electric force acting on each of the original four charges, +Q, is zero.
Q. A bicycle wheel rotates uniformly through 2.0 revolutions in 4.0 s. What is the linear speed of a point 0.10m from the center of the wheel?