Question

If a positive red puck is placed direclty south to a positive black puck, and the black puck immediately moves nourth, what is happening?

1. A. There is no force acting on the red positive charge.

B. There is a force acting on the red positive charge that has the same magnitude and direction as the force acting on the black positive charge.

C. There is a force acting on the red positive charge that has the same magnitude and opposite direction as the force acting on the black positive charge.

2. A. Nothing.

B. The black charge moves away from the red charge, in a straight line, with a constant speed.

C. The black charge moves away from the red charge, in a straight line, with a constant acceleration.

D. The black charge moves away from the red charge, in a straight line, with a changing acceleration.

Answer 1

C. There is a force acting on the red positive charge that has the same magnitude and opposite direction as the force acting on the black positive charge.

Because, As the both pucks have postive charge there will be repulsive force between the two pucks. So, the bucks move in the opposite direction to each other.

D. The black charge moves away from the red charge, in a straight line, with a changing acceleration.

Because, as the distance increases the magnitude of force decreases. so, acceleration of pucks also decreases.