Lecture_19_(Chap.21)

Lecture_19_(Chap.21) - Announcements Exam 2 on 3/30...

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Announcements Exam 2 on 3/30 (Wednesday), 8-9:30 PM, PHYS 112. Covers materials from Chap.18–21. Emphasis on concepts. Practice exam is posted on the course home page. rib sheet provided As same as that in the practice exam Crib sheet provided. As same as that in the practice exam. No calculator is needed. There will be a lab session on Tuesday as usual. HW Chap.21 due on 3/30 (Wednesday) by 5 PM. 1
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A Velocity Selector B v q E q F Is it possible to arrange E and B fields so that the total force on a moving charge is zero? q E v B     Fq  B v E F E E E vB What if v varies? B F B E B v
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A Cyclotron V equivalent ~ 10 8 V v~c : t V V cos v<<c : m q 2 2 / 1 c v m B q 0 need to adjust B or 0 2 V N V equivalent
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Hall Effect B v q F m 0 B e F F v E B v e E e e h B v E e B ???? Bh v h E V e V >0 + -
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Hall Effect for Opposite Charges B v q F m v E v E B >0 V >0 B ???? V <0 + - + -
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Hall Effect By measuring the Hall effect for a particular material, e can determine the sign of the moving particles we can determine the sign of the moving particles that make up the current Edwin Herbert Hall (1855 - 1938)
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Hall Effect in a Metal Bh v h E V e J v n q J n q v h /( ) J Ih d n q JBh V Knowing the charge ( e ) we can measure n Monovalent metals: n is the same as # of atoms per m 3 Some metals: n is larger than of atoms per m 3 # of atoms per m
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licker Question Clicker Question Voltmeter 1 reading is POSITIVE Voltmeter 2 reading is POSITIVE Mobile charges are: A) Positive (holes) B) Negative (electrons) ) Not enough information C) Not enough information
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licker Question Clicker Question Voltmeter 1 reading is POSITIVE Voltmeter 2 reading is POSITIVE E Mobile charges are: qvB A) Positive (holes) B) Negative (electrons) ) Not enough information v - C) Not enough information qvB 9 v +
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Magnetic Force on a Current-carrying Wire Current: many charges are moving Superposition: add up forces on individual charges Number of moving charges in short wire: B v q F m l nA otal force: Total force:     m F nA l qv B nqAv l B   I Force of a short wire: B l I F
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This note was uploaded on 04/23/2011 for the course PHYS 272h taught by Professor Staff during the Spring '08 term at Purdue.

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Lecture_19_(Chap.21) - Announcements Exam 2 on 3/30...

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