When you touch a friend after walking across a rug on a dry day, you typically draw a spark of about 2 mm. The magnitude of the electric field for which dielectric breakdown occurs in air is about 3 MV/m. Estimate the potential difference between you and your friend before the spark. Answer in units of V.
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- An air-filled parallel-plate capacitor has plates of area 2.00 cm2 separated by 1.80 mm. The capacitor is connected to a(n) 21.0 V battery. (a) Find the value of its capacitance. pF (b) What is the charge on the capacitor? pC (c) What is the magnitude of the uniform electric field between the plates? N/CAn air-filled parallel-plate capacitor has plates of area 2.10 cm2 separated by 2.00 mm. The capacitor is connected to a(n) 11.0 V battery. (a) Find the value of its capacitance. pF (b) What is the charge on the capacitor? pC (c) What is the magnitude of the uniform electric field between the plates? N/CBatteries and capacitors can be used to store electrical energy. Batteries do this in the form of chemical potential energy whereas capacitors do this with an electric field. Batteries tend to be more stable but capacitors tend to have faster charge and recharge times. A simple capacitor can be constructed from two conductive plates. Two conductive plates with an area of 10.0cm x 10.0 cm are held facing one another at a separation of 1.50 mm and 12.0 V is applied between them. a) Find the capacitance of this configuration b) Find the charge on the plates. c) How much energy is stored in the capacitor? d) How much energy can the capacitor store if a dielectric with K= 4.5 is inserted between the plates rather than air?
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