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The potential of a certain electrostait...

The potential of a certain electrostaitc field has the form `varphi = a (x^(2) + y^(2)) + bz^(2)`, where `a` and `b` are constants. Find the magnitude and direction fo the electric field strength vector. What shape have the equipotentail surfaces in the fololowing cases:
(a) `a gt 0, b gt 0`, (b) `a gt 0, b lt 0` ?

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