An electron enters a magnetic field whose direction is perpendicular to the velocity of the electron. Then
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a
The speed of the electron will increase
b
The speed of the electron will decrease
c
The speed of the electron will remain the same
d
The velocity of the electron will remain the same
answer is C.
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Detailed Solution
Force acts perpendicular to the velocity in a magnetic field, so speed of electron will remain the same.Since trajectory of the electron is circular , its velocity changes.