An electron in the SEM electron beam is moving parallel to...

Name: Problem 71, Chapter 28: College Physics Explore and Apply
Uploaded: 2020-10-26T08:48:35-08:00
Duration: 2 min 25 s
Channel: Sheh Lit Chang
Description: An electron in the SEM electron beam is moving parallel to the paper and downward toward the bottom of the page. In which direction should a magnetic field point to deflect the electron toward the right as seen while looking at the page? (a) Right (b) Left (c) Toward the top of the page (d) Toward the bottom of the page (e) Into the paper (f) Out of the paper

An electron in the SEM electron beam is moving parallel to the paper and downward toward the bottom of the page. In which direction should a magnetic field point to deflect the electron toward the right as seen while looking at the page? (a) Right (b) Left (c) Toward the top of the page (d) Toward the bottom of the page (e) Into the paper (f) Out of the paper

An electron in the SEM electron beam is moving parallel to the paper and downward toward the bottom of the page. In which direction should a magnetic field point to deflect the electron toward the right as seen while looking at the page?
(a) Right
(b) Left
(c) Toward the top of the page
(d) Toward the bottom of the page
(e) Into the paper
(f) Out of the paper

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Key Concepts

Magnetic Force on Moving Charges

This concept explains that a moving charge in a magnetic field experiences a force given by the equation F = q(v × B). The magnetic force is always perpendicular to both the velocity of the charge and the magnetic field direction, which influences the path of the charged particle without doing work on it.

Vector Cross Product

The cross product is a mathematical operation used to determine a vector that is perpendicular to two given vectors. In the context of the magnetic force, it determines the direction of the force relative to the directions of the velocity and the magnetic field.

Right-Hand Rule

The right-hand rule is a convention used to determine the direction of the cross product of two vectors. For a positive charge, if you point the fingers of your right hand in the direction of the velocity and curl them toward the magnetic field, your thumb points in the direction of the resulting force.

Effect of Charge Sign on Force Direction

The sign of a charged particle determines how it responds to the magnetic force. Since electrons have a negative charge, the direction of the force they experience is opposite to the direction predicted by the right-hand rule, which must be taken into account when analyzing their deflection.

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