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A small bob is suspended from the roof w...

A small bob is suspended from the roof with a string and hangs vertically. The bob is given a charge +q and a uniform horizontal electric field is set up o the neighbourhood of the bob. Now the bob hangs intjhe field such that the string makes an angle of `30^(@)` with the vertical. If the charge on te bob is made +3q, and the bob once again comes to equilibrium, then the angle made by the string with the vertical will be

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