Posted by **rosan** on Friday, November 8, 2013 at 9:41pm.

Four charges are arranged at the corners of a regular tetrahedron (a pyramid with four sides that are identical equilateral triangles). The charges are 1 Coulomb each, and the sides of the tetrahedron are all 1 meter. How much energy in Joules is required to assemble this arrangement of charge

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**bobpursley**, Friday, November 8, 2013 at 9:45pm
I just did this. http://www.jiskha.com/display.cgi?id=1383954041

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**rosan**, Friday, November 8, 2013 at 9:53pm
Thank you very much

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**rickross**, Saturday, November 9, 2013 at 6:08am
An insulating sphere of mass m and positive charge q is attached to a spring with length h and spring constant ks and is at equilibrium as shown below:

An infinitely long wire with positive linear charge density λ is placed a distance l away from the charged mass at equilibrium as shown below (note that the position of the top of the spring is fixed):

The previous length of the spring was h. What is the new length of the spring in terms of h, q, ke (type "ke"), λ (type "lambda"), l, and ks (type "ks") as needed. Indicate multiplication with a "*" sign and division with a "/" sign. HINT: You can do this without considering the mass or gravitational force.

length of the spring = ???

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