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March 30, 2015

March 30, 2015

Posted by **Lanise** on Monday, January 25, 2010 at 9:28pm.

What is the magnitude of the charge on each ball? (Neglect the mass of the thread.)

q = C

I got this from drwls but I am still unable to figure it out.

I got the angle A as 12.27 and then

tan12.27 = F/Mg = F/.09g x9.8m/sec^2

.2174 x .09g x 9.8m/sec^2 = F = .1917468

I used F so F=E = kq/r^2

.1917468 = 9.0 x 10^9 x q/.19^2

.1917468 x 19^2/9.0 x 10^9 = 7.69117722 x 10^13 C = q

This the wrong answer. Please help.

This is the help from drwls.

physics - drwls, Sunday, January 24, 2010 at 2:50am

Compute the angle of the strings from vertical. It is sin^-1 (8.5/40)

Call this angle A

If the string tension is T

T sin A = F (the Coulomb force)

T cos A = M g

tan A = F/Mg

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