Two closed surfaces (a cube) and (a sphere) enclose the same point charge at their…
PHYSICS · Multi-part · A Level · Physics · Fields and their consequences · Fields and their consequences
Problem
Two closed surfaces S1 (a cube) and S2 (a sphere) enclose the same point charge q at their respective centres and are situated in vacuum.
(i) Will the electric flux through S1 and S2 be equal or different? Explain your answer.
(ii) Will the distribution of the electric field on the two surfaces be identical? Give a qualitative justification.
(iii) If the region inside S1 is filled with a dielectric of relative permittivity 2 while S2 remains in vacuum, comment on the electric flux through each surface, giving reasons for your answer.