Electric field and magnetic field in a region of space is given by →E=Eo^j and →B=Bo^j.A particle of specific charge α is released from origin with velocity →v=vo^i.Then path of particle. Note- Eo,Bo and vo are constant values.
A
is a circle
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B
is a helix with uniform pitch
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C
is a helix with non-uniform pitch
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D
is cycloid
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Solution
The correct option is B is a helix with non-uniform pitch Electric field (acting along ^j direction) will change the velocity component which is parallel to →B (which is also along →j direction). →B=Bo^j and →v=vo^j will rotate the particle in a circle.
Hence the net path is helical with variable pitch.