PHY213_Introduction_Chapter15_Sec4to6

PHY213_Introduction_ - Medical Physics General Physics Chapter 15 Electric Forces and Electric Fields Medical Physics General Physics Electric

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Unformatted text preview: Medical Physics General Physics Chapter 15 Electric Forces and Electric Fields Medical Physics General Physics Electric Fields Sections 4 – 6 Medical Physics General Physics Electrical Field • Michael Faraday (1791 – 1867) developed an approach to discussing fields • An electric field is said to exist in the region of space around a charged object – When another charged object enters this electric field, the field exerts a force on the second charged object Medical Physics General Physics Electric Field, cont. • A charged particle, with charge Q, produces an electric field in the region of space around it • A small test charge , q o , placed in the field, will experience a force MU28T11-12: Electric Force Field Medical Physics General Physics Electric Field Definition • Mathematically, • SI units are N / C • The electric field is a vector quantity • The direction of the field is defined to be the direction of the electric force that would be exerted on a small positive test charge placed at that point o q = F E E q F = Medical Physics General Physics Electric Field due to a Positive Spherical or Point Charge • The electric field produced by a positive charge is directed away from the charge – A positive test charge would be repelled from the positive source charge • The magnitude of the electric field produced by the positive charge is 2 2 r Q k E q r Qq k q F E e e = → = = Medical Physics General Physics • The electric field produced by a negative charge is directed toward the charge – A positive test charge would be attracted to the negative source charge • The magnitude of the electric field produced by the negative charge is Active Figure:...
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This note was uploaded on 08/25/2009 for the course PHY 213 taught by Professor Cao during the Summer '08 term at Kentucky.

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PHY213_Introduction_ - Medical Physics General Physics Chapter 15 Electric Forces and Electric Fields Medical Physics General Physics Electric

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