The third law of newton states that for an action there exists an equal and opposite reaction. One of the example of third law of motion is "a rifle is fired and recoils when the bullet leaves the gun".
The two forces acting on the object are action force and the reaction force. The magnitude of both forces are equal but act in opposite direction.
Hence, the force on the bullet is the same but the direction of force is opposite.
Explanation: When the electrons move in another direction, they convert this chemical potential energy to electricity in the circuit, thus discharging the battery. So, the battery is all potential energy.
