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1. Electric charges and fields — Physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 SciencePhysics1. Electric charges and fields1 Mark
MCQ
There is a solid sphere of radius $‘R’$ having uniformly distributed charge throughout it. What is the relation between electric field $‘E’$ and distance $‘r’$ from the centre ( $r$ is less than R ) ?
  • A
    $E \propto {r^{ - 2}}$
  • B
    $E \propto {r^{ - 1}}$
  • ✓
    $E \propto r $
  • D
    $E \propto {r^2}$
✓

Answer

Correct option: C.
$E \propto r $
c
(c) $E = \frac{1}{{4\pi {\varepsilon _0}}}.\frac{{Qr}}{{{R^3}}}$ $==>$ $E \propto r$

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