Posted by Anonymous on Monday, February 18, 2013 at 2:31pm.
A= 4πr² =>
r=sqrt(A/4π )= sqrt(1.2/4•3.14)= 0.31 m
φ=q/4πε₀r =>
q= 4πε₀rφ=
=4π•8.85•10⁻¹²•0.31•590=2.03•10⁻⁸ C
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