An electron is projected into a magnetic field along the lines of force. Then
there will be no effect on its motion
the electron will travel along a circle and its speed remains unchanged
the electron will follow the path of a parabola and its speed will increase
the velocity will increase in magnitude but its direction will remain unchanged.
A
the electron will follow the path of a parabola and its speed will increase
B
the electron will travel along a circle and its speed remains unchanged
C
there will be no effect on its motion
D
the velocity will increase in magnitude but its direction will remain unchanged.
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Solution
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if →v∥→B then θ = 0 ⟹→FB = 0
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