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A particle of mass m and charge Q is at...

A particle of mass m and charge Q is attached to a string of length l. It is whirled in a vertical circle in the region of an electric field E as shown in the figure-5.105.What is the speed given to the particle at the point B,so that tension in the string when the particle is at A is ten times the weight of the particle?

A

`sqrt(5gl)`

B

`sqrt(5(g-(QE)/(m)))l`

C

`sqrt((QEl)/(m))`

D

`sqrt(5(g+(QE)/(m)))l`

Text Solution

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The correct Answer is:
D
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