The force between two small charged spheres having charges of $2×{10}^{-7}C$ and $3×{10}^{-7}C$ placed 30 cm apart in the air is:

Subtopic:  Coulomb's Law |
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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

Subtopic:  Coulomb's Law |
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Dimensional formula of $\frac{k{e}^{2}}{G{m}_{e}{m}_{p}}$ is:

Subtopic:  Coulomb's Law |
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Four point charges qA = 2μc, qB = -5μc, qC = 2μc and qD = -5μc are located at corners of a square ABCD of side 10 cm. The force on a charge of 1μc placed at the center of the square is:

(1) 2 N

(2) 1 N

(3) 5 N

(4) 0 N

Subtopic:  Coulomb's Law |
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Two point charges qA = 3 µC and qB= –3 µC are located 20 cm apart in a vacuum. The electric field at the midpoint O of the line AB joining the two charges is:

(1) 4.5×106 N/C along OA

(2) 5.4×106 N/C along OA

(3) 4.5×106 N/C along OB

(4) 5.4×106 N/C along OB

Subtopic:  Electric Field |
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A system has two charges, qA = 2.5 x 10-7 C and qB = -2.5 x 10-7 C, located at point A: (0, 0, -15 cm) and B: (0, 0, +15 cm) respectively. The electric dipole moment of the system is:
1.  7.5 × 10-8 C-m (along negative z-axis)
2.  8.5 × 10-8 C-m (along positive z-axis)
3.  5.5 × 10-8 C-m (along positive z-axis)
4.  3.5 × 10-8 C-m (along negative z-axis)

Subtopic:  Electric Dipole |
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An electric dipole with dipole moment   is aligned at 30° with the direction of a uniform electric field of magnitude  The magnitude of the torque acting on the dipole is:

Subtopic:  Electric Dipole |
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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.

Subtopic:  Electric Field |
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A polythene piece rubbed with wool is found to have a negative charge of . Transfer of mass from wool to polythene is:
1. 0.7 × 10 - 18   kg
2. 1.7 × 10 - 17   kg
3. 0.7 × 10 - 17   kg
4. 1.7 × 10 - 18   kg

Subtopic:  Electric Charge |
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Two insulated charged copper spheres A and B have their centers separated by a distance of 50 cm. What is the mutual force of electrostatic repulsion if the charge on each is  ? The radii of A and B are negligible compared to the distance of separation.

Subtopic:  Coulomb's Law |
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