Figure shows how the electric field from two point charges can be drawn by finding the total field at representative points and drawing electric field lines consistent with those points. While the electric fields from multiple charges are more complex than those of single charges, some simple features are easily noticed.
For example, the field is weaker between like charges, as shown by the lines being farther apart in that region. (This is because the fields from each charge exert opposing forces on any charge placed between them.). Furthermore, at a great distance from two like charges, the field becomes identical to the field from a single, larger charge.
1. Which statement is not true about electric field
(i) They are purely a geometrical construction to visualize the nature of electric field
(ii) They have no physical existence
(iii) We can compare the strength of electric field between 2 points by just looking at the distribution of field lines
(iv) Electric filed lines due to a positive charge is represented by a straight line terminating at the charge
2. Electric field lines about a positive point charge are
(i) Radially outwards
(ii) Circular and clockwise
(iii) Radially inwards
(iv) Parallel straight lines
3. A proton and electron are placed in a uniform electric field. Which statement is right?
(i) The electric forces acting on them will be equal
(ii) The magnitude of the electric forces will be equal
(iii) Their acceleration will be equal
(iv) The magnitude of their acceleration will be equal
4. A hemisphere is uniformly charged positively. The electric field at a point on a diameter away from the centre is directed
(i) Perpendicular to the diameter
(ii) Parallel to the diameter
(iii) At an angle tilted towards the diameter
(iv) At an angle tilted away from the diameter
