In an A.C. generator,when the plane of the co | vedclass

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(B) The magnetic flux linked with the coil is given by $\phi_B = B A \cos 	heta$,where $	heta$ is the angle between the normal to the plane of the c

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magnetic flux is maximum and induced $e.m.f.$ is zero.

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(B) The magnetic flux linked with the coil is given by $\phi_B = B A \cos 	heta$,where $	heta$ is the angle between the normal to the plane of the coil and the magnetic field vector $B$.When the plane of the coil is perpendicular to the magnetic field,the normal to the coil is parallel to the magnetic field,so $	heta = 0^{\circ}$.Thus,the magnetic flux $\phi_B = B A \cos(0^{\circ}) = B A$,which is the maximum value.The induced $e.m.f.$ is given by $\varepsilon = -\frac{d\phi_B}{dt} = B A \omega \sin(\omega t)$.At $	heta = 0^{\circ}$,$\omega t = 0$,so $\varepsilon = B A \omega \sin(0^{\circ}) = 0$.Therefore,the magnetic flux is maximum and the induced $e.m.f.$ is zero.

In an $A.C.$ generator,when the plane of the coil is perpendicular to the magnetic field:

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