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 x 102 m2and 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) Toshow that this voltage poses a small hazard, calculate the energy stored.

Two parallel conducting plates are separated by 10.0 cm, and have an area of 1200 cm2. One of them istaken to be at zero volts.(a) What is the electric field strength (in kV/m) between them, if the potential 6.00 cm from the zero voltplate (and 4.00 cm from the other) is 550 V?(b) What is the voltage between the plates?(c) What is the total charge on the positive plate of the capacitor?(d) What is the total energy stored in the capacitor?

(a) When a 6.50-v battery is connected to the plates of a capacitor, it stores a charge of 32.0 µc. What is the value of the capacitance? (b) If the same capacitor is connected to a 17.5-V battery, what charge is stored?

An anxious physicist worries that the two metal shelves of a wood frame bookcase might obtain a high voltage if charged by static electricity, perhaps produced by friction. (a) What is the capacitance (in F) of the empty shelves if they have area 2.80 x 102 m² and are 0.300 m apart? F (b) What is the voltage between them (in V) if opposite charges of magnitude 2.30 nC are placed on them? V (c) To show that this voltage poses a small hazard, calculate the energy stored (in J). (d) The actual shelves have an area 100 times smaller than these hypothetical shelves. Are his fears justified? Yes No