question 13 lorce acts on it? 21. Identif (a) H (b) 120 (c) 15 (Hint: 22. In the
ID: 1658764 • Letter: Q
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question 13
lorce acts on it? 21. Identif (a) H (b) 120 (c) 15 (Hint: 22. In the center 12 × At thi (b) wh 12. Three small balls, each of mass 13.3 g, are suspended sepa- rately from a common point by silk threads, each 1.17 m long. The balls are identically charged and hang at the corners of an equilateral triangle 15.3 cm on a side. Find the charge on each bal 13.JA cube of edge a carries a point charge q at each corner. Show that the resultant electric force on any one of the charges is given by 0.262q2 Ega 23. a directed along the body diagonal away from the cube. 25-5 Continuous Charge Distributions ectr bond. ion at force 14. Equation 25-15 was derived assuming the charge go was lo- cated on the positive y axis. (a) Does Eq. 25-15 remain valid s located at negative y? Explain, (b) Write an 24. TheeExplanation / Answer
Q13.
F1 = 1/4piE0 * q^2/a^2
The resultant of the nearest neighbour forces is sqrt(3)F1
The force on a charge due to charges on the diagonals of the faces shared with the charge is
F2 = 1/4piE0 * q^2/2a^2
Resultant of F2 is 2*sqrt(3/2)F2
Force due to the charge on the opposite,
F3 = 1/4piE0 * q^2/3a^2
R = sqrt(3)F1 + sqrt(3)F2 + F3
= 1//(4piE0) * q^2/a^2 * (sqrt3 + sqrt(3/2) + 1/3)
= 0.262q^2/E0a^2
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