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Magnetic Forces and Wires - Understanding B-Field and Torque

Explore the impact of multiple wires on magnetic fields, forces on loops, and torque on loops. Lab experiments on e/m ratio and current-carrying coils. Calculate forces on wire 3 caused by wire 1 and 2.

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Magnetic Forces and Wires - Understanding B-Field and Torque

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  1. Today4/14 • B-Field due to many wires • HW: 4/14 “Wires” Due Thursday, 4/17 • Magnetism HW delayed till Monday 4/14I will go over it today • Force on Loops and Torque on loops both due on Wednesday 4/16 • Friday and Monday are holidays! • Lab: e/m ratio for electron

  2. Lab: Current carrying coils (two separate coils) Electron gun e- Exactly like HW due today V radius of curved path

  3. I2 r I1 r 2 r I3 Magnetic Forces, Wires Find the force on wire 3 caused by wire 1 and 2.

  4. I2 I1 B1,y = 0 B1,x = Bo B2,y = Bo/2 B2,x = Bo/2 r B1 =  0 I/2 r B2 = B1/ 2 B2 B2 = Bo/ 2 Bnet = B1 +B2 added as vectors Bnet = Bo/ 2 Magnetic Forces, Wires First find the direction of the B field at the X. All currents are the same As an example, find Bnet = Bo 45

  5. I2 I1 F = I l Bnet I3 Bnet Magnetic Forces, Wires Now find the force on wire 3. Note: Sin  = 1  = 90 F = IlBo/2

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