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A small sphere with mass 2.80 g hangs by a thread between two large parallel vertical...

A small sphere with mass 2.80 g hangs by a thread between two large parallel vertical plates 5.00 cm apart. The plates are insulating and have uniform surface charge densities +σ and −σ. The charge on the sphere is q = 8.90×10−6 C .

What potential difference between the plates will cause the thread to assume an angle of 30.0∘ with the vertical?

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