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A charge \( Q \) is placed at the centre of a closed cube. The flux emitted from any one face of the cube will be:

The electric field due to a uniformly charged sphere of radius R as a function of the distance from its centre is represented graphically by:

Two infinitely long parallel conducting plates having surface charge densities \(+\sigma\) and \(-\sigma\) respectively on inner faces are separated by a small distance. The medium between the plates is vacuum. If \(\epsilon_{0}\) is the dielectric permittivity of vacuum, then the electric field in the region between the plates is:

Two parallel large thin metal sheets have equal surface charge densities (\(\sigma = 26.4 \times 10^{-12}\,\mathrm{C}/\mathrm{m}^2\)) of opposite signs. The electric field between these sheets is

Three point charges \(+q\), \(-2q\) and \(+q\) are placed at points \((x=0, y=a, z=0)\), \((x=0, y=0, z=0)\) and \((x=a, y=0, z=0)\) respectively. The magnitude and direction of the electric dipole moment vector of this charge assembly are: