The electrostatic force on a small sphere of charge 0.4 µC due to another small sphere of charge –0.8 µC in the air is 0.2 N. The distance between the two spheres is:
1. 14 cm
2. 12 cm
3. 16 cm
4. 10 cm
Dimensional formula of is:
1. [M1L1T1]
2. [M0L1T1]
3. [M0L0T0]
4. [M-1L0T2]
A system has two charges, and , is located at points : and : respectively. The electric dipole moment of the system is:
1. | (along negative z-axis) |
2. | (along positive z-axis) |
3. | (along positive z-axis) |
4. | (along negative z-axis) |
1. | 2. | ||
3. | 4. |
Which of the following statements about electric field lines (due to static charges) is incorrect?
1. | electric field lines never cross each other at any point. |
2. | electric field lines do not form any closed loop. |
3. | electric field lines can not be taken as continuous curves. |
4. | electric field lines start from a positive charge and end on a negative charge. |
A polythene piece rubbed with wool is found to have a negative charge of Transfer of mass from wool to polythene is:
1.
2.
3.
4.
Two insulated charged copper spheres and have their centers separated by a distance of What is the mutual force of electrostatic repulsion if the charge on each is
(the radii of and are negligible compared to the distance of separation.)
1.
2.
3.
4.