Electrostatics 1 Question 6

6. Charges Q,2Q and 4Q are uniformly distributed in three dielectric solid spheres 1,2 and 3 of radii R/2,R and 2R respectively, as shown in figure. If magnitudes of the electric fields at point P at a distance R from the centre of spheres 1,2 and 3 are E1,E2 and E3 respectively, then

(2014 Adv.)

Sphere-1

Sphere-2

(a) E1>E2>E3

(b) E3>E1>E2

(c) E2>E1>E3

(d) E3>E2>E1

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Answer:

Correct Answer: 6. (d)

Solution:

  1. E1=kQR2, where k=14πε0

m2=k(2Q)R2E2=2kQR2E3=k(4Q)R(2R)3E3=kQ2R2



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