The value of \(\langle L_x^2 \rangle\) in the state |φ〉 for which \(L^2|\varphi\rangle=6 \hbar^2|\varphi\rangle\) and \(L_z|\varphi\rangle=2 \hbar|\varphi\rangle\), is

1
0
2
4ℏ2
3
2ℏ2
4
2

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