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Published byEdiz Babaoğlu Modified over 5 years ago
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Example: calculate the magnetic field at point P due to a thin straight wire of length L carrying a current I. (P is on the perpendicular bisector of the wire at distance a.) y P dB r a x z ds I x L ds is an infinitesimal quantity in the direction of dx, so
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y P dB r a x z ds I x L
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y P dB r a look integral up in tables, use the web,or use trig substitutions x z ds I x L
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y P dB r a x z ds I x
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Solution beginning with vector notation
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y P dB r a x z ds I x When L, or
The r in this equation has a different meaning than the r in the diagram!
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