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Gauss law cannot be used to find which of the following quantity?

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Gauss law cannot be used to find which of the following quantity?

(a) Electric field intensity

(b) Electric flux density

(c) Charge

(d) Permittivity

This question was posed to me during a job interview.

My question comes from Gauss Law in division Electrostatic Fields of Electromagnetic Theory

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The correct choice is (d) Permittivity

To elaborate: Permittivity is constant for a particular material(say permittivity of water is 1). It cannot be determined from Gauss law, whereas the remaining options can be computed from Gauss law.

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