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The electric field intensity 2m from the surface of a charged sphere is 30.86 x103 N/C. The charge density
at the surface of the sphere is 8.85 x 19‒7 coul/m2
. What is the radius of the sphere ?
• Hint: The Gaussian surface area of the big sphere of radius, r + 2 is : A = 4π (r +2 )2 Ans. r = 2.5 m

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