31. |
Charge Q each is placed on (n - 1) corners of a regular polygon of sides n. The distance of each corner from the centre of polygon is r. The electric field at its centre is _____ .
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Answer:
Option (c) |
32. |
The number of electric field of lines emerging from 1 C charge is ______ . (ε0 = 8.85 × 10-12 MKS)
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Answer:
Option (c) |
33. |
When 1019 electron are removed from a neutral metal plate through some process, the charge on it becomes _____.
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Answer:
Option (b) |
34. |
A charge Q is placed at the centre of a cube. The electric flux emerging from any one surface of the cube is _____ .
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Answer:
Option (a) |
35. |
In 1g of a solid, there are 5 × 1021 atoms. If one electron removed from 0.01% atoms of the solid, the charge gined by the solid is _____ . ( Here electronic charge = 1.6 × 10-19 C)
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Answer:
Option (a) |
36. |
Electrostatic force between two electrons 1 cm apart is _____ N.
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Answer:
Option (c) |
37. |
Two identical spheres with charges 4q and -2q are kept at some distance apart exert a force F on each other. If they are made to touch each other and replaced at their old positions, the force between them will be _____ .
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Answer:
Option (b) |
38. |
Charges 2Q and -Q are placed as shown in the figure. The point at which electric field intensity is zero will be _____ .
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Answer:
Option (b) |
39. |
An electron is released from rest in an uniform electric field of 27.3 ×105 N/C. The time taken by it to attain a speed of 0.16c will be _____ . (c = 3 ×108 ms-1)
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Answer:
Option (c) |
40. |
Electric dipole moment is a _____ .
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Answer:
Option (b) |