For a positive point charge, the lines radiate ………. . While, for a negative point charge, the lines converge …………. .

For a positive point charge, the lines radiate outward. While, for a negative point charge, the lines converge inward.

Explanation:

The electric field produced by a single point charge has a radial shape and follows an inverse square law. The magnitude is given by

where

k is the Coulomb's constant

q is the magnitude of the charge

r is the distance from the charge

The direction of the field depends on the sign of the charge. In particular, we have:

This is due to the fact that the direction of the field shows the direction of the force that a positive test charge would experience in this field. Therefore, since a positive test charge would feel a repulsive force in the field produced by a positive charge, then the direction of the field is outward; on the other hand, a positive test charge would feel an attractive force in the field produced by a positive charge, therefore the direction of the field is inward.

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