# Any cross product r rr f qv b rr r f r rr f il b rr

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Unformatted text preview: CT r rr F = qv × B rr τ = r ×F r rr F = IL × B rr τ = µ×B r r µ0 I ds × r ˆ dB = 4π r 2 2. Direction of Magnetic Moment Fingers: Current in Loop Thumb: Magnetic Moment 3. Direction of Magnetic Field from Wire Fingers: Magnetic Field Thumb: Current 06 Physics 212 Lecture 14, Slide 17 Physics Calculation Two parallel horizontal wires are located in the vertical (x,y) plane as shown. Each wire carries a current of I =1A flowing in the directions shown. What is the B field at point P? y y I1=1A . 4cm x 4cm I2=1A Front view z 3cm P Side view • Conceptual Analysis – – Each wire creates a magnetic field at P • B from infinite wire: Β = µ0Ι / 2πr Total magnetic field at P obtained from superposition • Strategic Analysis – – :33 Calculate B at P from each wire separately Total B = vector sum of individual B fields Physics 212 Lecture 14, Slide 18 Physics Calculation Two parallel horizontal wires are located in the vertical (x,y) plan...
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