$(a)\;2;2.1\times10^{-34}JS^{-1}\qquad(b)\;3;4.1\times10^{-34}JS^{-1}\qquad(c)\;1;2.1\times10^{-20}JS^{-1}\qquad(d)\;4;3.2\times10^{-20}JS^{-1}$

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