Which of the following conditions is wrong with respect to specia
| Which of the following conditions is wrong with respect to special gaussian surfaces
A. At each point of the surface D is always normal to the surface
B. D is sectionally constant over that part of the surface where d is normal.
C. The surface is closed
D. At each point of the surface D is either normal or tangential to the surface
Please scroll down to see the correct answer and solution guide.
Right Answer is: A
SOLUTION
The Gaussian surface is an arbitrary closed surface in three-dimensional space through which flux of the vector field (the gravitational field or magnetic field) is calculated.
The examples of some valid Gaussian surfaces include the surface of the sphere, cylinder, cube, etc. Some surfaces cannot be used as Gaussian surfaces such as disc surfaces, square surfaces, etc.
Essential properties of Gaussian surface:
- It should be closed surface so that a clear distinction can be made between points that are inside the surface, on the surface, and outside the surface.
- This surface must pass through the point where the electric field is to be calculated.
- The surface must have a shape according to the symmetry of the source so that the field is normal to the surface at each point and constant in the magnitude.
- For a system of charges, the Gaussian surface should not pass through any discrete charge. It is because the electric field at the location of any charge is not well defined. However, the Gaussian surface can pass through a continuous charge distribution.