21 AB is a vertical rigid infinite wire carrying a linear charge of density 2 10 C m A particle having mass m 2 g and charge Q 1

Question

21 AB is a vertical rigid infinite wire carrying a linear charge of density 2 10 C m A particle having mass m 2 g and charge Q 1 C is fixed to the wire by means of a light insulating and inextensible string having length 2 2 m The vertical velocity u in with which it should be projected under gravity from the shown position so that the string slacks when its angle with vertical becomes 45 is correct upto the first two decimal places U m l A a

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