3. Three point charges are located at the coners of an equilateral triangle as s

Question

3. Three point charges are located at the coners of an equilateral triangle as shown in the sketch. The length of each leEsd- lhe distance from point P to any of the charges is a/sqrt(3). The potential at infinity is the zero evel. Find a formula for the electric potential V at point P, the center of the triangle. B) V -2kQ / sqrt(3):a - 20 -40 +40 4. The capacitance of a parallel plate capacitor with a Tefion dielectric is required to be 2.0 nF and it must withstand a maximum potential difference of 1000 V before the dielectric breaks down. Find the plate area required, given that the dielectric constant of Tefion is 2.1 and the dielectric strength of Teflon is 60 x 10 V/m. A) 2.0 cm2 B) 30 cm2 C) 10.0 cm2 D) 16 cm2 E) 18 cm2 capacitor has a capacitance of 40.0 puF and is initially uncharged. A battery is connected to it and eventually a potential difference of 10.0 V across the capacitor's plates. How much total energy is stored in the when it is fully charged (the current stops flowing)? A) 2.0 H B) 2.0 m C) 200 w D) none of the other choices E) zero

Explanation / Answer

5) E = 0.5CV^2

= 0.5*40*10^-6*10^2

= 20*10^-4 J

= 2*10^-3 J = 2mJ

so option B) is the correct answer

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