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Electric potential in space V(x,y,z) = (...

Electric potential in space V(x,y,z) = `(x^(2) + y^(2) + z^(2))V`
Then the magnitude of electric field strength E at (1m, 0, 2m) in N/C is:

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The correct Answer is:
D
`E=-((del V)/(del X)hati + (del V)/(dev V)hatj + (del V)/(del z)hatk)`
`=-(2x hati + 2y hatj + 2z hatk)`
`vecE = -(2hati + 0 hatj + 4hatk)`
`E = sqrt(20) = 2sqrt(5) = 4.47`
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