Question
A nervous physicist worries that the two metal shelves of his wood frame bookcase might obtain a high voltage if charged by static electricity, perhaps produced by friction. (a) What is the capacitance of the empty shelves if they have area $1.00 \times 10^2 \textrm{ m}^2$ and are 0.200 m apart? (b) What is the voltage between them if opposite charges of magnitude 2.00 nC are placed on them? (c) To show that this voltage poses a small hazard, calculate the energy stored.
1. $4.43 \times 10^{-9} \textrm{ F}$
2. $0.904 \textrm{ V}$
3. $1.81 \times 10^{-9} \textrm{ J}$
Solution Video