Two point charges are a small distance apart. a. Sketch the electric field lines for the two if one has a charge four times that of the other and both charges are positive.
b. Repeat for the case in which both charges are negative.

Explanation:

We know that, like charges repel and unlike charges attract each other.

IF one of the charge is four times that of the other and both charges are positive, the field lines is shown in figure (1).

Two negative charges attract each other, the field lines is shown in figure (2).

The net force between charges is given by :

Whre

k is the electrostatic constant

r is the distance between charges

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