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State what is meant by a line of force in an electric field.
A charged metal sphere is isolated in space. State one similarity and one difference between the gravitational force field and the electric force field around the sphere.
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A line of force in an electric field at a point represents the direction of the electric force on a free positive charge placed at that point.
Similarity
One similarity of the gravitational force field and the electric force field around the sphere is that both field lines are radial.
Difference
One difference between the gravitational force field and the electric force field around the sphere is that the gravitational field lines are directed towards the sphere, while the electric field lines are directed towards or away from the sphere depending on the charge on the sphere.
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