일반물리학 2 — Electric Potential: Problem 63

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