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Sahay Sir > Question Answers > Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) > A small sphere with mass 1.2 g hangs by a thread between two 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=9×10 −6 C. What potential difference 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 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=9×10 −6 C. What potential difference between the plates will cause the thread to assume an angle of 37 ∘ with the vertical as shown in figure ?

A 100 eV electron is projected directly toward a large metal plate that has surface charge density of −2.0 × 10^−6 C/m . From what distance must the electron be projected if it is to just fail to strike that plate?