Two pieces of metal are connected to one another by a plastic rod. A student finds that when one has a charge of 12 nC, and the other has a charge of -12 nC, the potential difference between them is $45\mathrm{V}$. What is the capacitance of the arrangement?

• A. $1.6\times {10}^{-10}\mathrm{F}$
• B. $2.1\times {10}^{-10}\mathrm{F}$
• C. $4.5\times {10}^{-10}\mathrm{F}$
• D. $6.7\times {10}^{-10}\mathrm{F}$
• E. $9.0\times {10}^{-10}\mathrm{F}$
• F. $2.7\times {10}^{-10}\mathrm{F}$