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Find the electric field inside the sphere which carries a charge density proportional to the distance from the origin

ρ = kr

  • a)
    ρ/ε0

  • b)
    ρr/3ε0

  • c)
     ρr20

  • d)
    ρr/ε0

Correct answer is option 'B'. Can you explain this answer?
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Find the electric field inside the sphere which carries a charge densi...
Charge density inside sphere where r< />
volume charge density(p)=Q/V=3Q/4πR^3
V=4/3πR^3
E=Qr/4π£•R^3 inside sphere
E=p/£•=3Qr/£•=3pr/£•
so E is proportional to pr/£•
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