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Magnetic Force and Magnetic Field

Magnetic Force and Magnetic Field - wire/loop at the...

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Dr. Chang When will there be a magnetic force F B present? When you have a charged particle moving in a magnetic field o F B = q v x B o F B = qvB sin (if v and B lie on the same plane) Ѳ o Carry out cross product of v (ijk) and B (ijk) if they do not lie on the same plane. o What right-hand Rule to use here? When you have a current-carrying wire placed in a magnetic field o F B = I L x B L has the direction as current I in the wire o F B = ILB sin (if L and B lie on the same plane) Ѳ o Carry out cross product of L (ijk) and B (ijk) if they do not lie on the same plane. o What right-hand Rule to use here? When you have two current-carrying wires, one wire and a loop, or two loops o Figure out the magnitude and direction of B field generated by one

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Unformatted text preview: wire/loop at the location of the other wire/loop (see below) Other than using a magnet, what other ways to produce a B field? Use current carrying wires. Note that the B field produced is not uniform. • Infinitely long straight wire lBl = μ o I/2 a π Rt-hand Rule • Finite length straight wire* lBl = ( μ o I/4 a) [sin π Ѳ 1 + sin Ѳ 2 ] Rt-hand Rule • Arc of wire lBl center = ( μ o I/4 a) π Ѳ Rt-hand Rule • Circular loop lBl center = ( μ o I/2a) Rt-hand Rule • Square Loop HW problem Rt-hand Rule • Rectangular Loop Think! Rt-hand Rule • Coil (Solenoid) lBl inside = μ o nI = μ o (N/ l )I Rt-hand Rule Draw a figure to go with each of the above....
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Magnetic Force and Magnetic Field - wire/loop at the...

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