Physics, 20.02.2020 20:50 macimitchell

1. A beam of charged particles enters a magnetic field and travels in a helical or spiral path What does the shape of the path indicate about the initial velocity of the particles?
A. The initial velocity is parallel to the magnetic field.
B. The initial velocity has components both parallel and perpendicular to the magnetic field.
C. The initial velocity is perpendicular to the magnetic field.
D. The initial velocity has greater magnitude than particles traveling in a circle through the magnetic field.

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Answer from: jazare05

B. The initial velocity has components both parallel and perpendicular to the magnetic field.

Explanation:

When a charged particle moves in a magnetic field, it experiences a force which is given by

$F=qvB sin \theta$

where

q is the charge

v is the velocity of the particle

B is the strength of the magnetic field

$\theta$ is the angle between the directions of v and B

From this formula, it is clear that the force has only a component in the direction perpendicular to direction of the the motion of the particle. Therefore:

if the initial velocity is perpendicular to the magnetic field, then the particle will follow a perfectly circular pathIf the initial velocity is parallel to the magnetic field, then the particle will continue moving straight, since it will experience no forceIf the initial velocity has components both parallel and perpendicular to the magnetic field, then it will move in a helical or spiral path, which is a composition of the two motions above (straight motion + circular motion)

Answer from: Quest

An atom (ours, not carroll's) consists of a positively charged nucleus, surrounded by one or more negatively charged particles called electrons. the positive charges equal the negative charges, so the atom has no overall charge; it is electrically neutral. most of an atom's mass is in its nucleus; the mass of an electron is only 1/1836 the mass of the lightest nucleus, that of hydrogen. although the nucleus is heavy, it is quite small compared with the overall size of an atom. the radius of a typical atom is around 0.1 to 0.25 nanometres (nm), whereas the radius of a nucleus is about 10-6 nm. * if an atom were enlarged to the size of the earth, its nucleus would be only 200 feet in diameter and could easily rest inside a small football stadium.read more on -

Answer from: Quest

conservation of mass

mass before something happens = mass afterwards

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