v33.2

A

0.34 mmn

B

0.57 mm

C

7.5 mm

D

0.75 mm

Text Solution

Verified by Experts

The correct Answer is:
D
`y=(e Ealpha^(2))/(4k) (K=K.E.)`
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NARAYNA-ELECTRIC CHARGES AND FIELDS-EXERCISE -4
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  2. Point P is at a distance of r(gtR) from the axis of the cylinder. The ...

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  3. An electron is projected as in fig. at a speed of 6x10^(6)ms^(-1) at a...

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  4. Two large conducting plates are placed parallel to each other with a s...

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  5. Three charges -q(1), +q(2) and -q(3) are placed as shown in the figure...

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  6. An electron is projected from a distance d and with initial velocity u...

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  7. Three large parallel plates have uniform surface charge densities as s...

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  8. A particles of mass 1kg and carrying positive charge 0.01C is sliding ...

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  9. six charges of equal magnitude, 3 poistive and 3 negative are to be pl...

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  10. Three concentric metallic spherical shells of radii R, 2R, 3R are give...

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  11. If E(a) be the electric field strength of a short dipole at a point on...

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  12. A positive charge Q is uniformly distributed along a circular ring of ...

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  13. A hemispherical shell is uniformly charge positively .the electric fie...

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  14. A point charge +q, is placed at a distance d from an isolated conducti...

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  15. An insulator (non-conductor) can be charged by a. conduction (b) ind...

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  16. Which one of the following graphs represents the variation of electric...

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  17. In a liquid medium of dielectric constant K and specific gravity 2 two...

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  18. A particle of mass 1kg and carrying 0.01C is at rest on an inclined pl...

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  19. v33.2

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  20. A bob of a simple pendulum of mass 40gm with a positive charge 4xx10^(...

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