A charged particle moves with constant velocity in a region where no effect of gravity is felt but an electrostatic field `vecE` together with a magnetic field `vecB `may be present. Then which of the following cases are possible ?
A
`vec(E) != 0, vec(B) != 0`
B
`vec(E)!=0, vec(B) = 0`
C
`vec(E) = 0. vecB = 0`
D
`vecE = 0, vecB != 0`
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