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Determine how much work is to be done to move a 10 C positive charge 1 m along the y-axis in a uniform electric field `vec(E ) - 5(hat(i) + hat(j)) V cdot m^(-1)`.

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Force acting on a charge q placed in a uniform electric field `vec(E )` is given by,
`vec(F) = qvec(E ) = 10 xx 5(hat(i) + hat(j))N`
Again, displacement along y-axis, `vec(s) = 1hat(j)m`
`:.` Work done = `vec(F) cdot vec(s) = 50 (hati +hatj) cdot hat(j) = 50 J`
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