PHYS 0175 1st Edition Lecture 22Outline of Last Lecture II. Interaction between magnetsII. Direction of magnetic field linesIII. Cross ProductIV. Magnetic Force on moving chargeV. Effect of sign of charge on magnetic forceVI. Relation between E and BCurrent LectureIII. Helical PathVII. Thermoionic effectVIII.Crossed E and B fieldsIX. Hall EffectCurrent LectureX. Helical Patha. If velocity has both perpendicular (centripetal) and || (forward) componentsb. Superposition of circular and rectilinearc. Analogous to parablad. Perpendicular will change dir(center seeking)e. || will be constf. net force is the resultant of x(|| F electric) and y(perpendicular F magnetic) componentsg. pitch=avgdist b/w 2 loopsi. only f(x) of || componenth. radiusi. only f(X) of perpendicular componentii. increase v perpendicular more narrow radiusiii. greater magnetic force by BXI. Thermoionic effecta. Charges have enough energy to escape metalXII. Crossed E and B fieldsa. Only B depends on vb. Particle will move in straight line if unaffected by bothc. Fnet=0; Fb=-Fei. No deflectionXIII. Hall Effecta. “Hall voltage”b. Applied voltage will create an Electric Fieldc. Apply Magnetic fieldi. Moving charge carriers will deflect and form a new voltage(potential
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