What amount of flux is links the surface of a hallow sphere having unit charge at its center?

What amount of flux is linked with YZ plane of a square of side 10 cm if vecE = 2hatj + 3hatk

The flux linking each side of a cube containing a chage q at its centre is

Due to the presence of a point charge at the centre of a spherical Gaussian surface of diatmer alpha , 10^6 Nm^2//C amount of electric flux passes through it. Keeping the point charge at the centre, the Gaussain surface is changed to a cubical Gaussian surface of side a. The flux through the new Gaussian surface will be

What will be the net flux through a closed surface due to a charge lying outside the closed surface?

What is the work done in moving a test charge over the surface of an isolated charged metal sphere.