The work done in moving a particle from a point \( (1,1) \) to \( (2,3) \) in a plane and in a f...

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The work done in moving a particle from a point \( (1,1) \) to \( (2,3) \) in a plane and in a force field with potential \( U=\lambda(x+y) \) is :
(A) 0
(B) \( \lambda \)
(C) \( 3 \lambda \)
(D) \( -3 \lambda \)
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