Quick Quiz 29.1 An electron moves in the plane of this paper toward the top 0 :

Question

Quick Quiz 29.1 An electron moves in the plane of this paper toward the top 0 : of the page. A magnetic field is also in the plane of the page and directed toward the right. What is the direction of the magnetic force on the clectron? (a) toward the top of the page (b) toward the bottom of the page (c) toward the left edge : of the page (d) toward the right edge of the page (e) upward out of the page (f) downward into the page What are the similarity and differences between electric force and magnetic force? (listed as bulletined items on page 871 and 873). Remember them? What is cyclotron frequency? What determines the value of cyclotron frequency? (page 876)

Explanation / Answer

(E) Upward, out of the page.

We can find the direction of the magnetic force by Right hand rule.

Right hand rule:

* index finger point out towards the direction of charge.

* middle finger points towards the direction of the magnetic field.

* thumb points towards the direction of the magnetic force.

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