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4. If the electric potential =-2xty-z+yz [V], find a) the electric field E at (2,1,3) and b) the electrostatic energy, U, stored in a cube

4. If the electric potential =-2xty-z+yz [V], find a) the electric field E at (2,1,3) and b) the electrostatic energy, U, stored in a cube of side 2 m centred at the origin (i.e., -1

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