Concept explainers
If a negatively charged particle enters a region of uniform magnetic field which is perpendicular to the particles’ velocity, will the kinetic energy of the particle increase, decreases or stay the same?
Answer to Problem 8Q
Solution:
Kinetic energy of negatively charged particle stays remain same because magnetic force is always perpendicular to velocity.
Explanation of Solution
Introduction.:
Explanation:
Power is defined as
And
From cross product is perpendicular to . So angle between and is .i.e. angle between magnetic force and velocity is .
Power supply by magnetic force is always zero, hence K.E. of charged particle does not change.
Conclusion:
Magnetic force does not change the K.E of charged particle.
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Physics: Principles with Applications
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