Section 3: authentic assessment ¿ 3-1 You will learn later that the magnetic for

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Section 3: authentic assessment ¿ 3-1 You will learn later that the magnetic force is given by F xB, but usually the speed of the charged particle is too slow to be able to visually see the effects of the magnetic force. However, electrons in CRTs move so fast, you can actually see them being deflected by a magnetic field. In fact, this is how old-fashioned "television" first worked. You must correctly predict whether the scintillation dot will be deflected horizontally or vertically when a magnetic field is created nearby the CRT. Then check your prediction. For this you will need to remember what the cross product means in the Lorenz force equation (better ask around if you don't), Fgx B and how to use the right-hand rule. Circle your predictions then check them experimentally while showing a student in a different group: Assessment #2 (magnet) Assessment #1 (magnet) (magnet) OR OR (magnet) "Yes, I have seen this student determine how magnetic fields affect moving electrons. They will be able to protect themselves from dangerous ions on their trip to Mars (if they take a magnet)!" If you are uncomfortable having another student check your work, please ask your TA

Explanation / Answer

assessment 1.

by the right hand rule , scintillation dot will move horizontally. so first figure is correct

assessment 2

by the right hand rule, scintillation dot will move vertically.so first figure is correct.

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