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The electric potential at points in an x...

The electric potential at points in an xy plane is given by `V = (2.00 V//m^(2) ) x^(2) - (3.00 V//m^(2) ) y^(2)`. What are (a) the magnitude and (b) angle (relative to `+x`) of the electric field at the point (4.00 m, 2.00 m)?

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(a) `20.0 V//m`, (b) `143^(@)`
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