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Moving Charges And Magnetism
Question
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A charge particle moves through a magnetic field perpendicular to its direction. Which of following quantity will change or remain unchanged (t) kinetic energy (ii) momentum?

Answer

When a charged particle is moving perpendicular to the direction of magnetuic field both, kinetic energy and momentum remains the same. The reason is, only the direction of the velocity component changes whereas, the magnitude of velocity remains the same.

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Some More Questions From Moving Charges And Magnetism Chapter

Two moving coil meters, M1 and M2 have the following particulars:
R1 = 10 Ω   N1 = 30,
A1 = 3.6 x 10–3 m2,  B1 = 0.25 T
R2 = 14 Ω;  N2 = 42,
A2 = 1.8 x 10–3 m2, B2 = 0.50 T
(The spring constants k are identical for the two meters).
Determine the ratio of (a) current sensitivity and (b) voltage sensitivity of M2 and M1.

Answer the following questions:
A charged particle enters an environment of a strong and non-uniform magnetic field varying from point to point both in magnitude and direction, and comes out of it following a complicated trajectory. Would its final speed equal the initial speed if it suffered no collisions with the environment?