Q121 / 200 · NEET 2023 (All India) · Physics

If ∮S E→·dS→=0 over a surface, then:

  • A
    The electric field inside the surface is necessarily uniform.
  • Correct answer
    B
    The number of flux lines entering the surface must be equal to the number of flux lines leaving it.
  • C
    The magnitude of electric field on the surface is constant.
  • D
    All the charges must necessarily be inside the surface.

Solution

The electric flux through a surface is the surface integral of the normal component of the electric field E over that surface. As net flux given by,∮S E→·dS→=0, therefore total number of flux lines entering the surface must be equal to the number of flux lines leaving it.

Hence, the correct answer is option: 'B'.

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