A charge is moving undeflected through Certain region in a space.Can we say that there is no magnetic field in that region? Give reason.
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Explanation:
Electric field (acting along
j
^
direction) will change the velocity component which is parallel to
B
(which is also along
j
direction).
B
=B
o
j
^
and
v
=v
o
j
^
will rotate the particle in a circle.
Hence the net path is helical with variable pitch.
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