An electron gun fires electrons into a magnetic field directedstraight downward.

Question

An electron gun fires electrons into a magnetic field directedstraight downward. Find the direction of the force exerted by thefield on an electron for each of the following directions of theelectron's velocity. (Remember that an electron has a negativecharge.)

(a) Horizontal and due north:
1 Horizontal and due west
Vertical and dueeast    
Vertical and due west
Horizontal and due east

(b) Horizontal and 30° west of north:
2 Horizontal and 30° north ofeast
Horizontal and 30° west ofnorth    
Horizontal and 30° east ofnorth
Horizontal and 30° south ofeast

(c) Due north, but at 30° below the horizontal:
3 Horizontal and due west
Vertical and duewest    
Vertical and due east
Horizontal and due east

(d) Straight upward:
4 Horizontal and due east
Horizontal and 30° east ofnorth    
Zero force
None of the above
1 Horizontal and due west
Vertical and dueeast    
Vertical and due west
Horizontal and due east
1 Horizontal and due west
Vertical and dueeast    
Vertical and due west
Horizontal and due east
1 2 Horizontal and 30° north ofeast
Horizontal and 30° west ofnorth    
Horizontal and 30° east ofnorth
Horizontal and 30° south ofeast
2 Horizontal and 30° north ofeast
Horizontal and 30° west ofnorth    
Horizontal and 30° east ofnorth
Horizontal and 30° south ofeast
2 3 Horizontal and due west
Vertical and duewest    
Vertical and due east
Horizontal and due east
3 Horizontal and due west
Vertical and duewest    
Vertical and due east
Horizontal and due east
3 4 Horizontal and due east
Horizontal and 30° east ofnorth    
Zero force
None of the above
4 Horizontal and due east
Horizontal and 30° east ofnorth    
Zero force
None of the above
4

Explanation / Answer

An electron gun fires electrons into a magnetic field directedstraight downward. Find the direction of the force exerted by thefield on an electron for each of the following directions of theelectron's velocity. (a) Horizontal and due north               Horizontal and due west
(b) Horizontal and 30° west of north:              Horizontal and 30° west ofnorth (c)Due north, but at30° below the horizontal:               Verticaland due west   (d)Straight upward:                Zero force Hope this helps u!         (c)Due north, but at30° below the horizontal:               Verticaland due west   (d)Straight upward:                Zero force Hope this helps u!        

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