- ACoulomb force is a central force.
- BThe force between two charges depend on the medium between them.
- CCoulomb force is a weak force.
- DThe net force on a charge is the vector sum of the forces acting on it due to several other charges.
Explanation:
Coulomb force is a strong force. It can be shown that the Coulomb force between two electrons is 1043 times than gravitational force. All the other options are basic properties of Coulomb’s Law.
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Two long parallel wires carrying equal current separated by 1m, exert a force of 2 on one another. The current flowing through them is
|
(a) 2.0 A |
(b) 2.0 |
(c) 1.0 A |
(d) 1.0 |
A convex lens has a focal length f. It is cut into two parts along the dotted line as shown in the figure. The focal length of each part will be

|
(a) |
(b) f |
(c) |
(d) 2f |
Two electric lamps of 40 watt each are connected in parallel. The power consumed by the combination will be
|
(a) 20 watt |
(b) 60 watt
|
(c) 80 watt |
(d) 100 watt |
A steady current i is flowing through a conductor of uniform cross-section. Any segment of the conductor has
|
(a) Zero charge |
(b) Only positive charge |
|
(c) Only negative charge |
(d) Charge proportional to current i |
A and B are two conductors carrying a current i in the same direction. x and y are two electron beams moving in the same direction
|
(a) There will be repulsion between A and B attraction between x and y |
|
(b) There will be attraction between A and B, repulsion between x and y |
|
(c) There will be repulsion between A and B and also x and y |
|
(d) There will be attraction between A and B and also x and y |