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NEET2023PhysicsElectrostaticsActual

If ∮ S   E → · d S → = 0 over a surface, then:

Options

  1. AThe electric field inside the surface is necessarily uniform.
  2. BThe number of flux lines entering the surface must be equal to the number of flux lines leaving it.
  3. CThe magnitude of electric field on the surface is constant.
  4. DAll the charges must necessarily be inside the surface.

Correct answer

B. The number of flux lines entering the surface must be equal to the number of flux lines leaving it.

Step-by-step 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 → · d S → = 0 , therefore total number of flux lines entering the surface must be equal to the number of flux lines leaving it.

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