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Bohr's postulate quantises the angular momentum of an electron in a stationary orbit as
A$L = h/n$
B$L = n\hbar$
C$L = nh^2$
D$L = nh$
Answer & Solution
Correct answer: B. $L = n\hbar$
$L = mvr = n\hbar = nh/(2\pi)$, $n = 1, 2, 3, \ldots$. Option B is off by a factor of $2\pi$ — a classic JEE trap.
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