Concept explainers
(i)
The number of the faces of cube through which electric field is zero.
(i)
Answer to Problem 1OQ
Option (b) 2.
Explanation of Solution
Assume that charged filament is very long or infinitely long. Therefore; there is same amount of charges on both side and electric field will not have any preferred direction as left or right. This means that electric field can go only inward or outward from filament. Net flux passing through these two surfaces is zero. Electric flux passes only remaining four sides of the cubical surfaces hence at these four sides there is non-zero electric field.
Therefore, number of faces which have zero electric field is two.
(ii)
The number of the faces of the cube through which electric flux is zero.
(ii)
Answer to Problem 1OQ
Option (b)
Explanation of Solution
It is given that charge filament is long and straight, this means electric field line will emit in radial direction only from cylindrical filament. No electric field line will cut the surface from which filament is going through. Therefore, at these two surfaces electric flux will be zero.
Therefore, it was clear that at two surfaces, zero electric field means zero flux.
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Chapter 24 Solutions
Physics for Scientists and Engineers with Modern Physics, Technology Update
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