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11. The unit of 1/4πεo is
A. C2 N-1 m-2
B. C -2 N-1 m2
C. C2 N1 m-2
D. C-2 N m2
Explanation:
12. A force exists between two point charges in air. If the charges are moved to a medium having εr =5 without altering the distance between them, the new force between them
A. will increase by 5 times
B. will decrease by 0.2 times
C. will decrease by √5 times
D. will increase by 25 times
Explanation:
13. Force between two charges depends on
A. distance between them
B. magnitude of charge
C. medium in between
D. all the above
Explanation:
14. If each of the charges is increased by two times and the distance between them is also increased by two times, the electromagnetic force between them
A. increases by 4 times
B. increases by 8 times
C. increases by 2 times
D. remains same
Explanation:
15. In nature, charge are available
A. as dipoles
B. as point charge
C. in integral multiples of the charge of electrons
D. in pairs
Explanation:
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