2. Four point-charges {q,-q, q, -q} are located on the z-axis at positions 2o+a/2, zo-a/2,-z0 + a/2 and -zo – a/2, respectively, as indicated in the figure.(a) What is the exact total electrostatic potential energyU of this configuration of these four charges?Two Finite Dipoles(b) For zo > a, use the expansion11-r+- +... to find the leading1+1term of U in powers of a/zo (in addition to the 20-independent term -q/[2n€pa]).(c) Assuming the charges +q at z = 20 + a/2 form a rigid dipole p, and the charges+q at z = -20 +a/2 form a rigid dipole p2, are the two dipoles attracted to eachother or repelled from each other?

2. Four point-charges {q,-q, q,-9} are located on the z-axis at -20 + a/2 and -zo – a/2, respectively, as indicated in the (a) What is the exact total electrostatic potential energy U of this configuration of these four charges?

2. Four point-charges {q,-q, q,-9} are located on the z-axis at -20 + a/2 and -zo – a/2, respectively, as indicated in the (a) What is the exact total electrostatic potential energy U of this configuration of these four charges?

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