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The force acting between two point charg...

The force acting between two point charges in vacuum is 10 N. If the charges are placed in a medium of relative permittivity 5, then the force acting between them will be—

A

`50 N`

B

`2 N`

C

`0.5 N`

D

`10 N`

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UNITED BOOK HOUSE-MODEL PAPER SET-07-EXERCISE
  1. A solid and a hollow sphere of same diameter are charged to a same pot...

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  2. The force acting between two point charges in vacuum is 10 N. If the c...

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  3. n number of cells e.m.f of each is E and internal resistance is r conn...

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  4. A circular coil A is of radius R and current I, another circular coil ...

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  5. In a ferromagnetic substance a magnetising force field of 360 Am^-1 pr...

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  6. The dimensional formula of magnetic flux is—

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  7. The current in a coil at time t is I = t^2e^(-t). The self inductance ...

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  8. In a region of free space the average electric field of an electromagn...

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  9. A concave mirror of focal length 0.15 m forms an in image doubled of t...

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  10. The refractive index of the material of a double equiconvex lens id 1....

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  11. The energy of photon for the maximum wavelength of visible light is ap...

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  12. The radioactive decay constant is 4.28 xx 10^-4 year^-1. What is the h...

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  13. The band gap between valence band and conduction band of a semiconduct...

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  14. The sky wave propagation is suitable for radiowaves of frequency—

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  15. Define the unit of magnetic induction ‘B’.

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  16. The unit of which quantity is Wb//A?

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  17. Write down lens maker’s formula using the symbols as used.

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  18. Write the condition for destructive interference.

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  19. What is a junction diode?

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  20. Draw the I-V characteristic curve for a diode.

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