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January 31, 2015

January 31, 2015

Posted by **alex** on Sunday, September 18, 2011 at 8:46pm.

Let k_e=8.98755*10^9 N*m^2/C^2

I used the formula

E=k_e(Q/r^2) because the distance is greater than the inner sphere; however, the answer I'm getting 106.362 N/C is supposedly wrong.

Am I using the wrong formula or what?

- physics -
**drwls**, Sunday, September 18, 2011 at 9:02pmr = 2.6 cm from the center is between the inner and the outer spheres. You got that right. Not all of the Q is inside the r = 2.6 cm radius, however.

The total Q you should use in your equation is 8 pC*

(2.6^2-1.7^2)/(3.7^2-1.7^2)

= 8 pC*0.3583

since the charge is uniformly distributed between the spheres.

- physics -
**alex**, Sunday, September 18, 2011 at 9:28pmOkay, when I took the quotient of the distance - r1 and r2-r1, I got 0.45

Then multiplied by Q gave me 3.6*10^-12 (I changed pC to C).

Am I doing something wrong again? How did you come up with 0.3583?

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