Which statement best defines the magnetic flux through a surface of area placed in a…

PHYSICS · Single correct · A Level · Physics · Fields and their consequences · Fields and their consequences

Problem

Which statement best defines the magnetic flux through a surface of area

A

placed in a uniform magnetic field

B

that makes an angle

\theta

with the surface’s normal? (a) It is the product of the magnetic field magnitude and the surface area, with no angular factor:

\Phi = BA

. (b) It is the product of

B

and the component of

A

that is perpendicular to the magnetic field, so

\Phi = BA\cos\theta

. (c) It is the product of

B

and the component of

A

that lies parallel to the magnetic field, giving

\Phi = BA\sin\theta

. (d) It is the product of

B

and the surface area multiplied by

\tan\theta

, written

\Phi = BA\tan\theta