AP EAMCET · PHYSICS · Electrostatics
An \(100 \mathrm{eV}\) electron is fired directly towards a large metal plate having surface charge density \(-2 \times 10^{-6} \mathrm{Cm}^{-2}\). The distance from where the electron be projected, so that it just fails to strike the plate is
- A \(0.22 \mathrm{~mm}\)
- B \(0.44 \mathrm{~mm}\)
- C \(0.66 \mathrm{~mm}\)
- D \(0.88 \mathrm{~mm}\)
Answer & Solution
Correct Answer
(B) \(0.44 \mathrm{~mm}\)
Step-by-step Solution
Detailed explanation
Given that, initial kinetic energy of electrons, \(K_i=100 \mathrm{eV}\) Initial potential energy, \(U_i=0\) Let \(K_f\) and \(U_f\) be final kinetic and potential energies, \(\therefore \quad K_f=0\) By using law of conservation of energy, \(K_i+U_i=K_f+U_f\) \(U_f=K_i\)…
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