Question

As shown if the figure, a conducting spherical shell, of inner radius R and outer radius 2R, carries a total charge +2Q(Q>0). A point charge +Q is placed at the center of the shell. Concentric to the conducting shell is an insulating spherical shell of radius 3R with negligible thickness. A charge +2Q is uniformly distributed on this insulating shell.

(a) What is the magnitude of electric force on the charge at the center?

1. 2kQ^2[1/(1.5R)^2 + 1/(3R)^2]

2. 2kQ^2[1/R^2]

3. 2kQ^2[1/R^2 + 1/(3R)^2]

4. Zero

5. 2kQ^2[1/(2R)^2 + 1/(3R)^2]

(b) What is the total charge on the outer surface of the conducting shell?

1. Q

2. 2Q

3. 3Q

4. Zero

5. 1.5Q

(c) What is the magnitude of the electric field at r=0.5R?

1. 2kQ/(0.5R)^2

2. 1.5kQ/(0.5R)^2

3. 5kQ/(0.5R)^2

4. kQ/(0.5R)^2

5. Zero

Answer 1

The electric field inside spherical shell