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Positive charge Q is placed on a conducting spherical shell with inner radius R1 and outer radius R2. A point charge q is placed at the center of the cavity. The magnitude of the electric field at a point outside the shell, a distance r from the center, is: Q 4πε0(R12 − r2) (q+Q) 4πε0(R12 − r2) Q 4πε0R12 q 4πε0r2 (q+Q) 4πε0r2

Positive charge Q is placed on a conducting spherical shell with inner radius R1 and outer radius R2. A point charge q is placed at the center of the cavity. The magnitude of the electric field at a point outside the shell, a distance r from the center, is: Q 4πε0(R12 − r2) (q+Q) 4πε0(R12 − r2) Q 4πε0R12 q 4πε0r2 (q+Q) 4πε0r2

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Positive charge Q is placed on a conducting spherical shell with inner radius R 1 and outer radius R 2 . A point charge q is placed at the center of the cavity. The magnitude of the electric field at a point outside the shell, a distance r from the center, is: Q 4 π ε 0 ( R 1 2 − r 2 ) ( q + Q ) 4 π ε 0 ( R 1 2 − r 2 ) Q 4 π ε 0 R 1 2 q 4 π ε 0 r 2 ( q + Q ) 4 π ε 0 r 2

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The charge density of an insulating sphere of radius R is given as ρ(r) = Q4πR2r. The insulation sphere is placed at the center of a conducting spherical shell of inner Radius of 2R and outer radius 3R which has the total charge of +2Q. Which of the followings is the magnitude of the electric field at the region R
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