Which circle has minimum flux in the following figure? circle p circle q circle r circle s

Circle Q

Explanation:

The flux of a field through a surface is given by:

where

F is the field strength

A is the area of the surface

is the angle between the direction of the field and the normal to the surface

In the figure, we see that the 4 surfaces have different orientations, so different angle . In the formula, we see that the flux is maximum when , which occurs when the field is perpendicular to the surface, and the flux is zero when , (because ) which occurs when the field is parallel to the surface.

In the figure, we see that circle Q is parallel to the direction of the field, so in this case the field is zero, while in all the other cases is not.

So, the correct answer is

Circle Q

the answer is a. at the equator

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