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Date Posted: 7/24/2008 10:28:33 AM  Status: Live
Problem 44
Course Textbook Chapter Problem
Calculus Based Physics Physics for Scientists and Engineers A Strategic Approach 1st by Knight 32 44P
Question Details:
You have a horizontal cathode ray tube (CRT) for which the controls have been adjusted such that the electron beam should make a single spot of light exactly in the center of the screen. You observe however that the spot is deflected to the right.  It is possible that the CRT is broken.  But as a clever scientist you realize that your laboratory might be in teh middle of a electric or magnetic field. Assuming that you do not have a compass, anymagnets, or any charged rods, how do you use the CRT itself to determine if the CRT is broken, in an electric field, or in a magnetic field?You cannot remove the CRT from the room>
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Date Posted: 7/24/2008 2:01:53 PM  Status: Live
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Response:
You can rotate the CRT half a turn (so it faces the other way). If there is an external magnetic field, then the spot should now be deflected the other direction (i.e. a little bit to the left instead of to the right).  If the deflection changes direction when the CRT faces the other way, then its being caused by something in the room and the CRT is not broken. If the spot remains deflected in the same direction (i.e. it stays to the right) then the CRT is broken.
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