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# Wire is carrying current from left to right two

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Unformatted text preview: 14, Slide 5 Physics Currents + Charges A long straight wire is carrying current from left to right. Two identical charges are moving with equal speed. Compare the magnitude of the force on charge a moving directly to the right, to the magnitude of the force on charge b moving up and to the right at the instant shown (i.e. same distance from the wire). BB v v (a) F a) |Fa |> |Fb| b) |Fa |= |Fb| c) |Fa |< |Fb| r B• (b) r •F I r rr F = qv × B r | F |= qvB sinθ Same q, |v|, B and θ (=90) Forces are in different directions 28 :10 Physics 212 Lecture 14, Slide 6 Physics Adding Magnetic Fields Two long wires carry opposite current BB B x x What is the direction of the magnetic field above, and midway between the two wires carrying current – at the point marked “X”? A) Left :13 B) Right C) Up D) Down E) Zero Physics 212 Lecture 14, Slide 7 Physics Force between current-carrying wires I towards d us • F B • r rr F12 = I 2 L × B F12 = I 2 L ⋅ µo I1 2πd A...
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