Magnetic Effects Of Current Question 338
Question: Which particles will have minimum frequency of revolution when projected with the same velocity perpendicular to a magnetic field [Orissa JEE 2002]
Options:
Li+
B) Electron is a subatomic particle with a negative electric charge.
C) Proton is a subatomic particle found in the nucleus of an atom, carrying a positive electric charge. It has a mass approximately 1836 times that of an electron. Protons, along with neutrons, determine the atomic number of an element, which defines the element’s identity. The number of protons in an atom’s nucleus is equal to the number of electrons in a neutral atom.
D) $ H{{e}^{+}} $
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Answer:
Correct Answer: A
Solution:
$ \nu =\frac{qB}{2\pi m}\Rightarrow \nu \propto \frac{q}{m} $
$ {{( \frac{q}{m} )}_{L{{i}^{+}}}} $ is maximum so
$ =B_{1}{{( 1+\frac{h^{2}}{r^{2}} )}^{-3/2}}=B_{1}( 1-\frac{3}{2}.\frac{h^{2}}{r^{2}} ) $ is minimum.
BETA
