Question

If the magnetic field is parallel to a surface, then magnetic flux through to the surface, is
A zero
B Small but not zero
C Maximum
D none of these​

Answer 1

Answer:

zero is the answer

Explanation:

if magnetic field is parallel it doesn't bisect together

Answer 2

If the magnetic field is parallel to a surface, then magnetic flux through to the surface is ZERO.

But why?

• The general expression of magnetic flux is:

$\therefore \: \phi = \vec{B}. \vec{A}$

$\implies \: \phi = | \vec{B}| | \vec{A}| \cos( \theta)$

• Now, when magnetic field intensity is parallel to the surface, that means : area vector is perpendicular to field intensity.

• So, value of $\theta$ = 90°.

$\implies \: \phi = | \vec{B}| | \vec{A}| \cos( {90}^{ \circ} )$

$\implies \: \phi = | \vec{B}| | \vec{A}| \times 0$

$\implies \: \phi = 0$

So, magnetic flux is zero.