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  1. To the given unperturbed Hamiltonian

    we add a small perturbation given by

    where ϵ is a small quantity. 
    The ground state eigenvector of the unperturbed Hamiltonian is
    2. A.
    (1/√2, 1/√2, 0)
    B.
    (1/√2, -1/√2, 0)
    C.
    (0, 0, 1)
    D.
    (1, 0, 0)

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    Answer : Option C

    Explanation :

    -NA-

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