Q: If the bound charge density is 12 units and the free charge density is 6 units, what is the susceptibility?  

Answer: C

The susceptibility (χe) can be calculated by dividing the bound charge density by the free charge density. In this case, the ratio is 12/6 = 2. Therefore, the susceptibility is 2. Susceptibility measures the extent to which a material can become polarized when exposed to an electric field.

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