Fundamentholfundamenthol
NEET2023Physics
Q.

If over a surface, then:

  1. A

    the magnitude of electric field on the surface is constant.

  2. B

    all the charges must necessarily be inside the surface.

  3. C

    the electric field inside the surface is necessarily uniform.

  4. D

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

Solution

By Gauss's law, . Zero flux implies zero net enclosed charge.

This means the field lines that enter the closed surface must also leave it — equal counts in and out. The field itself need not be zero, constant, or uniform.

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