Answer:
57.94°
Explanation:
we know that the expression of flux
[tex]\Phi =E\times S\times COS\Theta[/tex]
where Ф= flux
      E= electric field
      S= surface area
    θ = angle between the direction of electric field and normal to the surface.
we have Given Ф= 78 [tex]\frac{Nm^{2}}{sec}[/tex]
             E=[tex]1.44\times 10^{4}\frac{Nm}{C}[/tex]
             S=[tex]\pi \times 0.057^{2}[/tex]
             [tex]COS\Theta =\frac{\Phi }{S\times E}[/tex]
 =  [tex]\frac{78}{1.44\times 10^{4}\times \pi \times 0.057^{2}}[/tex]
 =0.5306
 θ=57.94°
