The electric potential V at a point P(x,y,z) in space is given by V=4x2 volt. Electric field at a point(1m,0,2m) in V/m is..
Electric potential V = 4x2 volts
The electric potential changes only along x-axis, We know that Ex = -dV/dx? Ex = - d(4x2)/ dx = - 8x
The electric field at point (1,0,2) will be (here x = 1) Ex – 8 volt/m