A charged particle enters a region which offers a resistance against its motion and a uniform mangetic field exists in the region. The particle traces a spiral path as shown in Fig. 1.29. State the following statements as True or False.
a. Component of magnetic field in the plane of spiral is zero.
(b) Particle enters the region at Q.
If magnetic field is outwards, then the particle is positively charged.
(d) If magnetic field is outwards, then the particle is negatively charged.

Options

A. Component of magnetic field in the plane of spiral is zero.
B. Particle enters the region at Q
C. If magnetic is outwards then the particle is positively charged.
D. If magnetic field is outwards then the particle is negatively charged.

Answer

A,B,C,D

Explanation

If particle has velocity component parallel to magnetic field path will be helical. Radius of path is decreasing so it enters at Q.