The grid (each square of 1mxx1m), repres...

The grid (each square of `1mxx1m`), represents a region in space containing a uniform electric field. If potentials at point O,A,B,C,D,E,F,G,H are respectively 0,-1,-2, 1,2,0,-1, 1 and 0 volts. Find the electric field intensity :

`(hati+hatj)V//m`

`(hati-hatj)V//m`

`(-hati+hatj)V//m`

`(-hati-hatj)V//m`

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