Physics II Lab w answers_Part_22

Physics II Lab w answers_Part_22 - I.3 Fig 2 When the...

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55 Fig 2 I.3 When the magnetic field is present the motion of the electron in the CRT is helical. This is seen as follows. Viewed along the Z-axis with the magnetic field coming out of the page, the magnetic field has the effect of making the electron move in a circular path (fig3). The centripetal force is B v e r v m 2 = -------- ( 1) with v ± r ( is the angular velocity of circular motion =cyclotron frequency) gives m B e = The time period of evolution is B e m 2 T ± = ------------------------------------ (2) Note that T is independent of v Along with the circular motion the electron has a longitudinal velocity v || ² v which transforms the purely rotational motion to helical path (fig 4) fig 4 I.4. The pitch of the helical motion is defined as longitudinal distance moved in one full rotational period i.e. Fig. 3
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56 I.4. The pitch of the helical motion is defined as longitudinal distance moved in one full rotational period i.e.
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This note was uploaded on 11/26/2011 for the course PHY 2053 taught by Professor Lind during the Fall '09 term at FSU.

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Physics II Lab w answers_Part_22 - I.3 Fig 2 When the...

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