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A charge +Q is uniformly distributed ove...

A charge +Q is uniformly distributed over a thin ring of the radius R. The velocity of an electron at the moment when it passes through the centre O of the ring, if the electron was initially at far away on the axis of the ring is (m=mass of electron, `K=1/(4pi epsi_(0))`)

A

`sqrt(((2KQe)/(mR)))`

B

`sqrt(((Kqe)/m))`

C

`sqrt(((Kme)/(QR)))`

D

`sqrt(((Kqe)/(mR)))`

Text Solution

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The correct Answer is:
A
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DC PANDEY ENGLISH-ELECTROSTATIC POTENTIAL AND CAPACITORS-(A) Chapter exercises
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  10. A capacitor of 4 mu F is connected as shown in the circuit. The intern...

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  11. A parallel plate capacitor is made of two dielectric blocks in series....

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  12. A number of capacitors each of capacitance 1 muF and each one of whic...

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  13. A series combination of n(1) capacitors, each of value C(1), is charge...

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  14. Two charges +6 muC and -4 muC are placed 15 cm apart as shown. At what...

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  15. Assume that an electric field vec(E) = 30 x^(2) hat(i) exists in spac...

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  16. An electron initially at rest falls a distance of 1.5 cm in a uniform ...

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  17. A long, hollow conducting cylinder is kept coaxially inside another lo...

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  18. The potential at a point x ( measured in mu m) due to some charges sit...

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  19. Three charges Q, +q and +q are placed at the vertices of a right-angle...

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  20. Four point charges each +q is placed on the circumference of a circle ...

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