When charge particle enters perpendicular to magnetic field, the path followed by it is:

Explanation

B. When a charged particle enters a magnetic field perpendicular to the field lines, the path it follows is circular. The motion of a charged particle in a magnetic field is governed by the Lorentz force, which acts perpendicular to both the velocity of the particle and the magnetic field. This force causes the charged particle to experience a centripetal acceleration, resulting in a circular path. The radius of the circular path can be determined by the equation: r = (m * v) / (q * B) where: r is the radius of the circular path m is the mass of the particle v is the velocity of the particle q is the charge of the particle B is the magnetic field strength The direction of the circular path depends on the charge and the orientation of the magnetic field. For a positively charged particle, the path is counterclockwise, while for a negatively charged particle, it is clockwise. It's important to note that if the charged particle has an initial velocity component parallel to the magnetic field, it will experience a force that alters its path, resulting in a helical motion.