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Proton in magnetic and electric field

  • Thread starter syhpui2
  • Start date
  • #1
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Homework Statement




As shown in the figure below, a proton moves in the +x direction with speed v and is immersed in both, a uniform magnetic field, B, oriented in the -z direction, and a uniform electric field, E (not shown in the diagram). What electric field orientation is required in order for the proton to move un-deflected through the combined magnetic and electric field region?
(a) +y direction
(b) -y direction
(c) +z direction

Answer is B.

http://i.imgur.com/1G80T.png

1G80T.png


Homework Equations



qE=qVB

The Attempt at a Solution



I used RHR, I get answer A...
 

Answers and Replies

  • #2
Delphi51
Homework Helper
3,407
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Which way does the B field push on the proton?
Which way should the E field push on it?
 
  • #3
28
0
Which way does the B field push on the proton?
Which way should the E field push on it?
Which way does the B field push on the proton? Along x-axis
Which way should the E field push on it? Opposite direction of qvb?
 

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