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A ball of mass (0.42 g) and positive charge (q = 38.6 μC) is suspended on a string of negligible mass in a uniform electric field. What is the subject of the question?

Answer :

Final answer:

This Physics question is about a positively charged ball suspended in a uniform electric field. The concepts of mass, charge, electrostatic force and gravitational force are significant in understanding and responding to this scenario.

Explanation:

The subject of this question pertains to Physics, specifically the study of electric fields. An electric field is a vector field that shows the direction and intensity of the force that a positively charged particle would experience at any given location. The uniform electric field mentioned in the question implies that the field's strength and direction are consistent at all points.

This question involves a scenario wherein a positively charged ball of a specific mass is suspended in such a field. The concepts of electrostatic force (the force acting on the charged ball due to the electric field) and gravitational force (the force acting on the ball due to its mass) are relevant here. The net force on the ball would be the vector sum of these two forces.

The Millikan oil drop experiment is a helpful context for understanding this question. In the experiment, Millikan deduced the charge on an electron by observing the behavior of tiny oil droplets in an electric field. A similar principle applies to the ball in the question - the forces on it would need to be balanced for it to remain suspended in the electric field.

Learn more about Physics of Electric Fields here:

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