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STD 11 - 2. structure of atom — JEE STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceJEESTD 11 - 2. structure of atom4 Marks
MCQ
Potential energy of electron present in $He^+$ is
  • A
    $\frac{{{e^2}}}{{2\pi { \in _0}r}}$
  • B
    $\frac{{3{e^2}}}{{4\pi { \in _0}r}}$
  • ✓
    $\frac{{ - {e^2}}}{{2\pi { \in _0}r}}$
  • D
    $\frac{{ - {e^2}}}{{4\pi { \in _0}{r^2}}}$
✓

Answer

Correct option: C.
$\frac{{ - {e^2}}}{{2\pi { \in _0}r}}$
c
$P.E.$ = $ - \frac{{KZ{e^2}}}{r} = \frac{{ - 1}}{{4\pi { \in _0}}} \times \frac{{2{e^2}}}{r} =  - \frac{{{e^2}}}{{2\pi { \in _0}r}}$

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