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Question
A solid sphere made of insulating material has a radius R and has a total charge Q distributed uniformly in its volume. What is the magnitude of electric field intensity, E, at a distance r (o less than r less than R) inside the sphere
Options:
A .   QR/(4π εo r3).
B .   Qr/(4 π εo R3).
C .   Q/(4 π εo r3).
D .   3 Qr/(4 π εo R3).
Answer: Option B

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