Answer Happy

A circular loop of radius r sits in a vacuum. The circular area of the loop faces upward. A charged ball moves along the axis of the loop, moving toward the center of the loop at a constant speed of 10 m/s. At time t = 0, the ball is 10 m above the loop, at t = 1 s the ball passes through the loop, and at t = 2 s the ball is 10 m below the loop. Which statement correctly describes the magnetic field in the loop? O There is no magnetic field near the loop at any time. O There is a magnetic field directed around the loop at t = 1s, but the field is zero at all other times. O There is a constant magnetic field perpendicular to the face of the loop at all times from t =0 to t = 2s. There is a magnetic field directed around the loop at all times from t = 0 to t = 2s, and its magnitude varies with time. a