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Posted by on Friday, November 8, 2013 at 6:40pm.

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

  • Physics pls anyone can help me? its urgent - , Friday, November 8, 2013 at 9:44pm

    Simple. What is the Potential energy of each charge? Well, PE is a scalar, so the distances are the same to each charge, so

    energy=k(q1Q2/r+Q1Q3/r+Q1Q4/r+Q2Q3/r+Q2Q4/r+Q3Q4/r)= 6k if all q are 1, all r is 1.

    Now consider putting the thing together.
    first charge, no energy
    second charge, energy= kQq/r=k
    third charge, energy= 2k
    fourth charge, energy=3k
    total work: 6k

  • Physics pls anyone can help me? its urgent - , Monday, November 11, 2013 at 10:00am

    what is k?

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