Question

An electron with mass m, velocity v and charge e describing half a revolution in a circle of radius r in a magnetic field B, will experience change in energy equal to​

Answer 1

Answer:

Answer is in the above picture

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Answer 2

Answer:  Zero change in energy will be experienced by electron.

Explanation:

$mass\ of\ electron=m\\velocity\ of\ electron=v\\charge\ on\ electron=e\\Centripetel force=mv^{^{2}}/r\\Magnetic\ force=evBsin90^{0}=evB$

$Power=F.v$

Both the forces, magnetic force and centripetal force are perpendicular to velocity which means power will be equal to 0.

Power is determined as the rate of doing work which is equal to the change in kinetic energy. ( work-energy theorem)

Therefore, the electron will undergo no change in energy.