Electric Field Lines
An electric field line in general is a curve drawn in such a way that the tangent to it at each point is in the direction of the electric field at that point. A field line is a space curve, i.e. a curve in three dimensions.
Electric field lines are thus used to pictorially map the electric field around a charge or a configuration of charges.
The density of field lines is more near the charge. Away from the charge, the field is weak, so the density of field lines is less.
What kind of charges are of 1, 2 and 3?
Options:
(a) `q_1 = -ve ,q_2 = -ve ,q_3 = -ve`
(b) `q_1= -ve ,q_2 =+ve,q_3 =+ ve`
(c) `q_1 =+ve ,q_2 = -ve ,q_3 = -ve`
(d) `q_1 = +ve ,q_2 =+ve ,q_3 =+ve`