A uniform metal meter-stick is balanced with a 1.0 kg rock attached to the left end of the stick. If the support is located 0.25
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Answer
given,
total charge Q = 100 n C
= 100 × 10⁻⁹ C
radius of the solid sphere = 30 cm
= 0.3 m
Volume of sphere =
=
=0.113 m³
a) volume charge density
ρ = 8.85 × 10⁻⁷ C/m³
b) at r = 10 cm = 0.1 m
charge in the sphere at radius
= 3.7037 \times 10^{-9}C[/tex]
Field strength
=
at r = 20 cm = 0.2 m
=
at r = 30 cm
= 9.99 N/C