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When a charged body enters a uniform magnetic field. How will it’s kinetic energy change?

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+2 votes
in Fluid Mechanics by (118k points)
When a charged body enters a uniform magnetic field. How will it’s kinetic energy change?

(a) Doubles

(b) 4 times

(c) Constant

(d) Triples

The question was asked during an interview.

The origin of the question is Kinetic Energy Correction and Momentum Correction Factors topic in portion Viscous Flow & Turbulent Flow of Fluid Mechanics

1 Answer

+2 votes
by (362k points)
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Best answer
Correct choice is (c) Constant

The explanation: The kinetic energy remains a constant as the magnetic field always exerts a force perpendicular to the particle’s velocity. So, there is no change in the velocity of the fluid. Therefore, kinetic energy remains the same.

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