42. What is the flux through a cube of side ’ a ’ if a point charge of q is at one of its corner ?

What is the flux through a cube of side ’ a ’ if a point charge of q is at one of its corner  ?

(a) \( \dfrac{2q}{\varepsilon_0} \)

(b) \( \dfrac{q}{8\varepsilon_0} \)

(c) \( \dfrac{q}{\varepsilon_0} \)

(d) \( \dfrac{q}{2\varepsilon_0} \)

Answer :  (b) \( \dfrac{q}{8\varepsilon_0} \)