APFIVE Electric Field from a Potential Function
An electric potential varies with position according to V(x,y,z) = 3x²z - 2y²z + 5z². At what point(s) in the xy-plane is the electric field purely in the z-direction?
A
Along the x-axis only
B
All points in the xy-plane
C
Along the y-axis only
D
Only at the origin
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