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A small ball if mass 2 xx 10^(-3) Kg hav...

A small ball if mass `2 xx 10^(-3) Kg` having a charges of ` 1 mu C` is suspended by a string of length ` 0. 8 m` Another identical ball having the same charge is kept at the point of suspension . Determine the minimum horizontal velocity which should be imparted to the lower ball so that it can make complete revolution .

Text Solution

Verified by Experts

To complete the circle at top most point `T_(2)=0`
` (##NAR_PHY_XII_V02_C02_S01_024_S01.png" width="80%"> `Mg-(q^(2)/(4piepsilon_(0)l^(2)))=(MV^(2))/(l)`
`rArr V^(2)-g^(l)=-(q^(2))/(4piepsilon_(0)Ml)....(1)`
from law of conservation of law
`(1)/(2)m u^(2)=(1)/(2)mv^(2)+mg2l....(2)`
from(1) and (2)
`u=sqrt(4gl-(q^(2))/(4piepsilon_(0)ml))=5.86m//s`
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