A proton moving with a constant velocity passes through a region of space without any change in its velocity.
A proton moving with a constant velocity passes through a region of space without any change in its velocity. If E and B represent the electric and magnetic fields respectively. Then, this region of space may have
(a) E=0, B=0
(b) E=0, B≠0
(c) E≠0, B=0
(d) E≠0, B≠0
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If both E and B are zero, then vector Fe and vector Fm both are zero. Hence, velocity may remain constant. Therefore, option (a) is correct.
If E = 0, B ≠ 0 but velocity is parallel or antiparallel to magnetic field, then also vector Fe and vector Fm both are zero. Hence, option (b) is also correct.
If E ≠ 0, B ≠ 0 but vector (Fe + Fm) then also velocity may remain constant or option (d) is also correct.
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