$7$ If a rectangular area is rotated in a uniform electric field from the position where the maximum

electric flux goes through it to an orientation where only half the flux goes through it$,$ what has

been the angle of rotation?

$60\backslash$deg

$30\backslash$deg

$45\backslash$deg

$26\mathrm{.}6\backslash$deg

$90\backslash$deg