Assertion A conducting loop is rotated in a uniform magnetic field with constant angular velocity `omega` as shown in figure. At time t = 0, plane of the loop is perpendicular to the magnetic field. Induced emf produced in the loop is maximum when plane of loop is parallel to magnetic field.
Reason When plane of loop is parallel to magnetic field, then magnetic flux passing through the loop is zero.

Options

A. If both Assertion and Reason are corrent and Reason is the corrent explanation of Assertion.
B. If both Assertion and Reason are correct but Reason is not the correct explanation of Assertion.
C. If Assertion is true but Reason is false.
D. If Assertion is false but Reason is ture.

Answer

B

Explanation

`phi=BA cos omegat`
As t = 0, `phi` = maximum
`|e|=|(dphi)/(dt)|=B omega A sin omega t`
`|e|_("max")` when `omegat=90^(@)`, i.e., loop is rotated `90^(@)`, or it is parallel to magnetic field. At this instant `phi=0`