Lecture_20_Part_1

Lecture_20_Part_1 - B v q F m = v B E = + B e F F B v e E e...

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Unformatted text preview: B v q F m = v B E = + B e F F B v e E e e = B v E e = ???? +- Bh v h E V e = = V &gt;0 Hall Effect h v B E &gt;0 +- V &gt;0 v B E ???? +- V &lt;0 Hall Effect for Opposite Charges B v q F m = By measuring the Hall effect for a particular material, we can determine the sign of the moving particles that make up the current Hall Effect Edwin Herbert Hall (1855 - 1938) What is the magnitude of the Hall effect in a metal? v n q J = Bh v h E V e = = n q J v = 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 Hall Effect in a Metal J = I / ( h i d ) B=1T 5mm 0.1mm I=20A What is V Hall for the shown copper ribbon? n Cu =8.4 . 10 28 m 3 V 5 10 5 . 1 = = = n q A IBh n q JBh V What is potential difference along 5 mm of copper ribbon to sustain current 20 A? Cu = 6 ....
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This note was uploaded on 04/02/2008 for the course PHYS 272 taught by Professor K during the Winter '07 term at Purdue University-West Lafayette.

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Lecture_20_Part_1 - B v q F m = v B E = + B e F F B v e E e...

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