A small sphere with mass 1.2 g hangs by a thread between two parallel vertical plates 5 cm apart. The plates are insulating and have uniform surface charge densities +δ and −δ . The charge on the sphere is q=9×10−6C. What potential difference (in V) between the plates will cause the thread to assume an angle of 37∘ with the vertical as shown in figure?

A small sphere with mass 1.2 g hangs by a thread between two parallel

1.	A small sphere with mass 1.2 g hangs by a thread between two parallel vertical plates 5 cm apart. The plates are insulating and have uniform surface charge densities +δ and −δ . The charge on the sphere is q=9×10−6C. What potential difference (in V) between the plates will cause the thread to assume an angle of 37∘ with the vertical as shown in figure?
Answer» A small sphere with mass $1.2 g$ hangs by a thread between two parallel vertical plates $5 c m$ apart. The plates are insulating and have uniform surface charge densities $+ δ$ and $- δ$ . The charge on the sphere is $q = 9 \times 10^{- 6} C$ . What potential difference (in V) between the plates will cause the thread to assume an angle of $37^{\circ}$ with the vertical as shown in figure?

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