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The unit of electric permittivity is

1. Volt/m$^2$
2. Joule/coulomb
3. Farad/m
4. Henry/m

Correct answer: Farad/m

Solution

Permittivity $\varepsilon$ appears in $C=\varepsilon A/d$. Since capacitance has unit farad and $d$ has unit metre, the unit of permittivity is farad per metre ($\text{F m}^{-1}$).

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