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lecture17

# lecture17 - Physics 2102 Gabriela Gonzlez Jean-Baptiste...

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1 Physics 2102 Gabriela González Quantitative rule for computing the magnetic field from any electric current Choose a differential element of wire of length dL and carrying a current i The field d B from this element at a point located by the vector r is given by the Biot-Savart Law: i μ 0 =4 π x10 -7 T.m/A (permeability constant) Jean-Baptiste Biot (1774-1862) ? Felix Savart (1791-1841) Compare with:

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2 An infinitely long straight wire carries a current i . Determine the magnetic field generated at a point located at a perpendicular distance R from the wire. Choose an element d s as shown Biot-Savart Law: d B ~ d s x r points INTO the page Integrate over all such elements
3 A power line carries a current of 500 A. What is the magnetic field in a house located 100m away from the power line? = 1 μ T!! Recall that the earth’s magnetic field is ~10 -4 T = 100 μ T A circular loop of wire of radius R carries a current i .

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