1.THE ELECTRIC POTENTIAL V AT ANY POINT IS GIVEN BY V=4X²

then find electric field at (1m,0,2m )

Simply differentiate wrt x and put the given values.........

see buddy, E=-dV/dr,

or as you say, partially differentiate it with respect to all coordinates in order to get the components of field...

Hence E(x)=-dV/dx (it should be debra but its not on my keyboard so...)

=-8x, and x=1, so E(x) =-8...

Now, E(y)=0, as partially dofferentiating this expression with respect to y will give zero, similarily for the z one...

Hence the final answer, E=8i

negative of diffrentiation is electric field