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4.Moving Charges and Magnetism
easy
A charged particle is projected in a plane perpendicular to a uniform magnetic field. The area bounded by the path described by the particle is proportional to
A
The velocity
B
The momentum
C
The kinetic energy
D
None of these
Solution
(c) $r = \frac{{\sqrt {2mK} }}{{qB}}$and $A = \pi {r^2} \Rightarrow A = \frac{{\pi (2mK)}}{{{q^2}{B^2}}} \Rightarrow A \propto K.$
Standard 12
Physics
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