A bar magnet is inside a closed cubical box. Magnetic field lines pointing outwa

Question

A bar magnet is inside a closed cubical box. Magnetic field lines pointing outward from the box produce positive flux, and those pointing inward produce negative magnetic flux. (a) Is the total magnetic flux through the surface of the box positive, negative, or zero? (b) Choose the best explanation from among the following:

I. There are more outward magnetic field lines because the magnet is inside the box.

II. The magnet draws field lines inward toward itself, producing more negative flux.

III. The same number of magnetic field lines leave the box as enter it.

Explanation / Answer

Here ,

magnetic monopoles does not exist in nature

due to this there will be equal strength of south and north pole inside the cubical box

a) hence , the total magnetic flux through the surface of box is ZERO

b)

the correct reason is

The same number of magnetic field lines leave the box as enter it.

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