The capacitors in the network shown in the figure all have a capacitance of 15 m

Question

The capacitors in the network shown in the figure all have a capacitance of 15 mu F. What is the equivalent capacitance, C_ab of this capacitor network? A) 15 mu F B) 3.0 mu F C) 12 mu F D) 9 mu F E) 6 mu F An ideal air-filled parallel-plate capacitor has round plates and carries a fixed amount of equal but opposite charge on its plates. All the geometric parameters of the capacitor (plate diameter and plate separation) are now four times the original. If the original capacitance was C_os what is the new capacitance? A) 16 C_o B) C_o/4 C) C_o D) C_o/16 E) 4 C_o Each plate of an air-filled parallel plate air capacitor has an area of 0 0040 m^2, and the separation of the plates is 0.080 mm. An electric field of 4 times 10^6 V/m is present between the plates. What is the energy density between the plates? A) 70.8 J/m^2 B) 124 J/m^2 C) 159.3 J/m^2 D) 39.8 J/m^2 E) 110.6 J/m^2

Explanation / Answer

1] capacitance of two in series = 15/2 = 7.5 uF

Capacitance of three capacitance in right = 15+7.5 = 22.5 uF

Net capacitance = 22.5*15/(22.5+15)

= 9 uF

option d is correct

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