lec21 - PEP112 Spring 2008 Prof. Svetlana Malinovskaya 2...

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PEP112 – Spring 2008 Prof. Svetlana Malinovskaya 2 April 2008 The Hall Effect. Magnetic Forces and Torques. Magnetic properties of Matter
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A. Left B. Up C. Down D. Into the page E. Out of the page An electron moves perpendicular to a magnetic field. What is the direction of ? B JG
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A. Left B. Up C. Down D. Into the page E. Out of the page An electron moves perpendicular to a magnetic field. What is the direction of ? B JG
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The Hall Effect Any charged particle moving through a vacuum is deflected sideways, perpendicular to velocity, by a magnetic field. Same is true for the charges moving through a conductor as part of a current. This phenomenon is called the Hall effect. Figure shows a magnetic field perpendicular to a flat, current-carrying conductor. Moving with the drift velocity electrons are deflected toward the top surface once the current starts flowing, but the process does not continue infinitely. The excess charges on the surfaces create potential difference and electric field inside the conductor. Charge builds up on the surface until the downward electric force balances the upward magnetic force. Once the forces are balanced, a steady state is reached.
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The steady State Condition • The steady-state potential difference between the two surfaces of the conductor is called the Hall voltage .
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This note was uploaded on 04/11/2008 for the course PEP 112 taught by Professor Whittaker during the Spring '07 term at Stevens.

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lec21 - PEP112 Spring 2008 Prof. Svetlana Malinovskaya 2...

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