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Question
A free electron is placed in the path of a plane electromagnetic wave. The electron will start moving
Options
along the electric field
along the magnetic field
along the direction of propagation of the wave
in a plane containing the magnetic field and the direction of propagation
Solution
along the electric field
As the electron is at rest initially, only the electric field will exert force on it. There will be no magnetic force on the electron in the stating. Hence, the electron will start moving along the electric field.
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