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The ratio of the forces between two char...

The ratio of the forces between two charges placed at a certain distance apart in air at half of the distance apart in medium of dielectric .k. is

A

`1: 4k`

B

`k: 4`

C

`4k: 1`

D

`4: k`

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The correct Answer is:
B
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AAKASH SERIES-ELECTRIC CHARGES AND FIELDS-Practice Exercise
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  3. The ratio of the forces between two charges placed at a certain distan...

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  5. Two small balls having equal positive charge QC on each are suspended ...

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  6. The force between two charges 4C and -2C which are separated by a dist...

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  7. Two charges 9 mu C and 1mu C are placed at a distance of 30cm. The pos...

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  8. Three point charges Q(1), Q(2) and Q(3) in that order are placed equal...

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  9. Tritium and helium are put 2 xx 10^(-10)m apart in air. Magnitude of i...

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  10. 10C and 20C are separated by a distance d. If the electric field at th...

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  11. A charge of mass .m. charge .2e. is released from rest in a uniform el...

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  12. A charge of 10^(-10C is placed at the origin. The electric field at (1...

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  13. Two point charges +8q and -2q are located at x=0 and x=L respectively....

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  14. A hollow spherical conductor of radius 1m has a charge of 250mu C then...

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  15. Two point charges q(A)= 3mu C and q(B) = - 3muC are located 20cm apart...

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  16. The displacement bar(r ) of a charge Q in an electric field E= e(1) ha...

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  17. A conducting sphere of radius R= 20cm is given a charge Q= 16 mu C wha...

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  18. A 0.50 gm ball carries a charge of magnitude 10mu C. It is suspended b...

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  19. Two equal and opposite charges of magnitude 0.2 mu C are 15 cm apart, ...

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  20. Three charges each of +4mu C are the corners B, C, D of a square ABCD ...

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