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A wooden ball covered with an aluminimum...

A wooden ball covered with an aluminimum foil having a mass m hangs by a fine silk thread l metre long in a horizontal electric field E. When the ball is given an electric charge q coulomb, it stands out d metre from the vertical line passing through !he · suspension point of thread. Show that the electric field is given by
`E = (mgd)/(sqrt(l^(2)-d^(2))`

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