# If the potential function is given by V=4x+3y, then the magnitude of electric field intensity at the point (2, 1) will be

Relation b/w V and E is, $E = -\frac{\mathrm{dV} }{\mathrm{d} r}$

$E = -\frac{\mathrm{dV} }{\mathrm{d} x} -\frac{\mathrm{dV} }{\mathrm{d} y}$

$E = -\frac{\mathrm{d(4x+3y)} }{\mathrm{d} x} -\frac{\mathrm{d(4x+3y)} }{\mathrm{d} y}$

$E = -4i -3j$ , this will be everywhere

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