Question

You and your team are designing a device that can be used to position a small, plastic object in the region between the plates of a parallel-plate capacitor. A small plastic sphere of mass m = 1.5 x 10-2 kg carries a charge q = +0.202 μC and hangs vertically (along the y direction) from a massless, insulting thread (length l=10.0 cm) between two vertical capacitor plates. When there is no electric field, the object resides at the midpoint between the plates (at x=0). However, when there is a field between plates the object moves to a new equilibrium position. (a) To what value should you set the field if you want the object to be located at x = 2.20 cm? (b) To what value should you set the field if you want the object to be located at x = -3.10 cm?

Answer 1

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