Electrons are fired at different speeds through a magnetic field and are bent from their straight-line paths to hit the detector at the points shown. Rank the speeds of the electrons from highest to lowest.
To Rank:
Answer to Problem 21A
Explanation of Solution
Introduction: Force,
Deflection of charged particles will be greater when the force due to the magnetic field is greater and force will be greater when speed v will be greater.
Here all the three electron beams are in the same magnetic field
Electron A have the greatest deflection, then electron B and then electron C has the lowest deflection.
Then the forces for the electrons for A, B, C are respectively.
From the order of deflection, the order of force is:
So from the above the order, of speeds of electrons must be
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