A point charge +Q is placed just outside an imaginary hemispherical surface of radius R as shown in the figure. Which of the following statements is/are correct?

A) Flux passing through curved surface + Flux passing through flat surface = 0  ϕ=−Q4πε02π1−cosθ Put θ=45° =−Q2∈01−12       B) at x&r is variable: E E⊥=Esinα =kQr2Rr =KQRr3E⊥ is not constant over the surfaceC) Total flux through the curved and the flat surface is zero, because enclosed charge is zero.D)  V=kQr=kQR2 . Circumference is equidistance from charge Q. Therefore it will be equipotential surface