A coil of area A and N turns is rotating with angular velocity ω in a uniform magnetic field B about an axis perpendicular to B. Magnetic flux φ and…

A coil of area A and N turns is rotating with angular velocity $\displaystyle \omega$ in a uniform magnetic field $\displaystyle \vec{B}$ about an axis perpendicular to $\displaystyle \vec{B}$. Magnetic flux $\displaystyle \varphi$ and induced emf $\displaystyle \varepsilon$ across it, at an instant when $\displaystyle \vec{B}$ is parallel to the plane of coil, are :