When a positively charged particle enters a region of uniform magne...

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When a positively charged particle enters a region of uniform magnetic field, its trajectory can be
I. a straight line.
II. a circle.
III. a helix.
IV. a spiral
(a) Only I
(b) II or III
(c) I or II
(d) Anyone of I, II or III
\( \mathrm{P} \)
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