Question

1)

A system with a point charge at the origin with charge +Q is surrounded by a spherical dielectric shell with dielectric constant κ= 2.0. Select the figure below that correctly represents the electric field map for the system.

Figure (a) Figure (b) + Dielectric Dielectric Figure (C) Dielectric

a) Figure a

b) Figure b

c) Figure c

2)

a		6.64x10-10 C/m2
b		0
c		-1.18x10-13 C/m2
d		1.18x10-13 C/m2
e		-6.64x10-10 C/m2

Answer 1

- ) outer 10 This is because of the polarisation. of tq charge at the centre option (6) is the correct answer Bucaual negative charge is developed at the inner face of the dielectric and consequently positive charge at the face and He Figure (l) is the corent figure. 2) know Electric field , & o to where o is the surface charge density to is the permittivity of free space Herce € 2 75 N/C to 8.85 X10 5 Ea to ore surface charge density Exto. 75 X 8.85X10 c/m? 2 6.64 % 10-10 c/m² option (a) is the correct answer. C²/Nm? 2 -12 2