A coil is placed in a magnetic field such tha | vedclass

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(D) The magnetic flux $\phi$ through a coil is given by the formula $\phi = \vec{B} \cdot \vec{A} = BA \cos 	heta$,where $B$ is the magnetic field ma

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$A, B, C$ and $D$

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(D) The magnetic flux $\phi$ through a coil is given by the formula $\phi = \vec{B} \cdot \vec{A} = BA \cos 	heta$,where $B$ is the magnetic field magnitude,$A$ is the area of the coil,and $	heta$ is the angle between the magnetic field vector and the area vector.$1$. By changing the magnitude of the magnetic field $(B)$,the flux $\phi$ changes. (Statement $A$ is correct).$2$. By changing the area of the coil $(A)$ within the magnetic field,the flux $\phi$ changes. (Statement $B$ is correct).$3$. By changing the angle $(	heta)$ between the direction of the magnetic field and the plane of the coil (which changes the angle between the magnetic field and the area vector),the flux $\phi$ changes. (Statement $C$ is correct).$4$. By reversing the magnetic field direction abruptly,the angle $	heta$ changes (e.g.,from $0^\circ$ to $180^\circ$),which changes the flux $\phi$. (Statement $D$ is correct).Therefore,all four methods can change the magnetic flux through the coil.

$A$ coil is placed in a magnetic field such that the plane of the coil is perpendicular to the direction of the magnetic field. The magnetic flux through a coil can be changed by:

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