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?
Select ALL correct options:
A
The circumference of the flat surface is an equipotential
B
The component of the electric field normal to the flat surface is constant over the surface.
C
Total flux through the curved and the flat surfaces is $\frac{\mathrm{Q}}{\varepsilon_0}$
D
The electric flux passing through the curved surface of the hemisphere is $-\frac{\mathrm{Q}}{2 \varepsilon_0}\left(1-\frac{1}{\sqrt{2}}\right)$
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