The Options are a, c, d, and e.
The gravity and the centripetal force can be considered same. For example, the moon keeps moving around the earth because of the balance between centripetal force and the Gravitational force. The centrifugal force is an outward force that will be acting opposite to Centripetal force.
The friction between the tyre and the road, when a car takes a U- turn on a curved path is a centrifugal force is an outward force that acts opposite of Centripetal force. Centripetal force helps object to move in a circle and acts in the inward direction.
a small object of mass 3.66 g and charge -17.6 µc is suspended motionless above the ground when immersed in a uniform electric field perpendicular to the ground. what are the magnitude and direction of the electric field?