Which of the following statements is correct? (1) If a moving charged particle enters into a reg...

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Which of the following statements is correct?
(1) If a moving charged particle enters into a region of magnetic field from outside, it does not complete a circular path.
(2) If a moving charged particle traces a helical path in a uniform magnetic field, the axis of the helix is parallel to the magnetic field.
(3) The power associated with the force exerted by a magnetic field on a moving charged particle is always equal to zero.
(4) If in a region a uniform magnetic field and a uniform electric field both exist, a charged particle moving in this region cannot trace a circular path.
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