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What is the SI unit used for electric flux?

1. C m⁻²
2. coulomb
3. ampere
4. volt metre

Correct answer: volt metre

Solution

Electric flux = E . A. Since electric field has units V/m and area m^2, flux has units (V/m)(m^2) = V m (volt metre), equivalently N m^2 C^-1. The correct unit is volt metre.

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