An electric dipole is placed inside a cube. What will be the nature of electric flux from the cube surface?a)Coming out of the surfaceb)Coming in towards the surfacec)No flux at alld)Coming out from one half and coming inwards in another halfCorrect answer is option 'C'. Can you explain this answer?

Question

Answer

Explanation:

Electric flux is the rate of flow of electric field through a surface. The electric field of a dipole decreases with distance, so the electric field lines coming from the positive charge will terminate on the negative charge within the dipole itself. Therefore, the net electric flux through the surface of the cube is zero. This is because the electric field lines entering the cube through one face will exit through the opposite face, and the same is true for all six faces of the cube. Hence, the nature of electric flux from the cube surface is no flux at all.

Therefore, option C is the correct answer.

Answer

An electric dipole consists of two point charges. The amount of charges is the same but their polarities are different. Therefore the sum of total charges in a dipole is always 0. But flux from a closed surface is related to the total charge inside a surface. As the total charge inside the cube is zero, so there will be no flux coming out or going in towards the surface.

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