A small magnet is dropped down a long vertical copper tube in a uniform gravitational field. after a long time, the magnet (a) attains a constant velocity (b) m

A small magnet is dropped down a long vertical copper tube in a uniform gravitational field. After a long time, the magnet (a) attains a constant velocity (b) moves with a constant acceleration (c) moves with a constant deceleration (d) executes simple harmonic motion