, i.e. rate of change of flux and flux, ϕ=B.A=BA‌cos‌θ where, B is magnetic field. A is area of cross-section. ∴ϕ=BA‌cos‌0°=BA⇒ϕmax=BA ∴ Induced emf is not zero. Therefore, A is false and R is true. When plane of coil is perpendicular to the magnetic field, then, θ=0°.