A pendulum bob of mass 80 milligram and carrying a charge of 2 × 10-8C is at rest in a horizontal uniform electric field of 2×104 Vm-1 . Find the tension in the thread of the pendulum and the angle it makes with the vertical. What are the magnitude and direction of electric field at centre of the square, if q=1.0×10-8C and a=5cm?
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