A charged particle can move with a constant velocity through a region containing both electric field and magnetic field only if the
a)electric field is parallel to the magnetic field
b) electric field is perpendicular to the magnetic field
c)electric field is parallel to velocity vector
d)magnetic field is parallel to velocity vector
e) magnetic field is perpendicular to velocity vector
a)electric field is parallel to the magnetic field
b) electric field is perpendicular to the magnetic field
c)electric field is parallel to velocity vector
d)magnetic field is parallel to velocity vector
e) magnetic field is perpendicular to velocity vector
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