Posted by **ali** on Saturday, January 1, 2011 at 4:31pm.

Three spheres, each with a negative chrge of 4.0x10^6C, are fixed at the vertices of an equilateral triangle whose sides are 0.20 m long. Calculate the magnitude and direction of the net electric force on each spehere.

i used this: (K)Cos30((4.0*10-6)*2)/(0.2*2)

and i get 3.1 every time...

- answered twice already -
**Damon**, Saturday, January 1, 2011 at 4:34pm
I have answered this one twice as well

^ means exponent

times 2 for two spheres forcing third

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**Damon**, Saturday, January 1, 2011 at 4:35pm
http://www.jiskha.com/display.cgi?id=1293915742#1293915742.1293916579

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**ali**, Saturday, January 1, 2011 at 4:49pm
thank you for responding:

i did:

(9.0*10^9)cos30((4.0*10^-6)^2)/(0.2^2)

using this i got 3.1. so then i need to double it because it's two spheres. right?

and sorry about the formula in the question. i confused my self with the "times" and "exponent".

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**Damon**, Saturday, January 1, 2011 at 5:29pm
cos 30 = 1/2

so 9*16 /4 and figure out decimal= 36 *10^(9-12+2)

= 3.6

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**Damon**, Saturday, January 1, 2011 at 5:31pm
oh sorry, cos 30 = .866

so

3.6*.866/.5

6.24

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**ali**, Saturday, January 1, 2011 at 5:49pm
thank you. this was very helpful.

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**Damon**, Saturday, January 1, 2011 at 6:27pm
You are welcome.

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**Diana**, Wednesday, February 9, 2011 at 2:09pm
Im working on this same question too and i cant figure out how you got the .5 when doing 3.6*.866/.5 ??? because i know the answer is correct, is it because the net force goes through the middle?

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