When does the magnetic flux become zero?

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(B) The magnetic flux $\Phi_B$ through a surface is given by the formula $\Phi_B = \vec{B} \cdot \vec{A} = BA \cos 	heta$,where $\vec{B}$ is the magn

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When the magnetic field is perpendicular to the area vector.

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(B) The magnetic flux $\Phi_B$ through a surface is given by the formula $\Phi_B = \vec{B} \cdot \vec{A} = BA \cos 	heta$,where $\vec{B}$ is the magnetic field vector,$\vec{A}$ is the area vector,and $	heta$ is the angle between them.For the magnetic flux to be zero,we must have $\cos 	heta = 0$.This occurs when $	heta = 90^{\circ}$.An angle of $90^{\circ}$ between the magnetic field vector and the area vector means the magnetic field is perpendicular to the area vector (or parallel to the plane of the surface).Therefore,the correct option is $B$.

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