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?

`sqrt(5gL)`

`sqrt(L(9g+(QE)/m))`

`sqrt(11gL)`

`v=sqrt(L(11g+(QE)/m))`

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