An electron is travelling along the x-direction. It encounters a magnetic field in the y-direction. Its subsequent motion will be :
A
straight line along the x-direction
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B
a circle in the xz-plane
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C
a circle in the yz-plane
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D
a circle in the xy-plane
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Solution
The correct option is B a circle in the xz-plane An electron is travelling along the x-direction. It encounters a magnetic field in the y-direction. Its subsequent motion will be a circle in the xz-plane It can be found out by using Flemming's left hand rule. Stretch your forefinger, middle finger and index finger in mutually perpendicular directions. Forefinger-magnetic field Middle finger-velocity vector of ion Index finger-force