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:
A) Li+
B) Electron
C) Proton
D) $ H{{e}^{+}} $
Show Answer
Answer:
Correct Answer: A
Solution:
$ \nu =\frac{qB}{2\pi m}\Rightarrow \nu \propto \frac{q}{m} $
$ {{( \frac{q}{m} )}_{L{{i}^{+}}}} $ is minimum so
$ =B_{1}{{( 1+\frac{h^{2}}{r^{2}} )}^{-3/2}}=B_{1}( 1-\frac{3}{2}.\frac{b^{2}}{r^{2}} ) $ is minimum.
BETA
