OPart 2: Torque on a wire loop Shown below-left is a square wire loop (the length of each side is L) that is set up to rotate about the central axis as shown. Below right, as viewed from the vantage point, are the upper side (side 12) & the lower side (side 34). The direction of the B-field being applied to the wire loop is also shown. The B-force on each side of the loop will be applied at each side's midpoint. [NOTE: I142 - 123 - l34 - l4s. The subscripts are there to highlight the fact that they are going different directions.] Wire Loop View from vantage point of wires 12 & 34 • VANTAGE POINT 141 1 12 Al23 l41 134 123 141 134 rotational axis Determine the lever, direction of force (as viewed from the vantage point), & direction of torque (as viewed from the vantage point) for each side. Lever for side 12: Direction of Fg on side 12: Choose direction v Direction of Fg Direction of Fg on side 34: Choose direction Direction of FB on side 41: Choose direction v Direction of r on side 12: Choose direction v Direction of r on side 23: Choose direction v Direction of r on side 34: Choose direction v Direction of r on side 41: Choose direction v Lever for side 23: side 23: Choose direction v Lever for side 34: Lever for side 41:

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Chapter1: Units, Trigonometry. And Vectors
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A Part 2: Torque on a wire loop
Shown below-left is a square wire loop (the length of each side is L) that is set up to rotate about the central axis as shown. Below right, as viewed from the vantage point, are the upper side (side 12) & the lower side (side 34). The direction of the B-field being applied to the wire loop is
also shown. The B-force on each side of the loop will be applied at each side's midpoint. [NOTE:I12 =I23 = 134 = l41. The subscripts are there to highlight the fact that they are going different directions.]
Wire Loop
View from vantage point of wires 12 & 34
VANTAGE POINT
141
1
12
12
A23
141
134
3
123
141
134
rotational axis
Determine the lever, direction of force (as viewed from the vantage point), & direction of torque (as viewed from the vantage point) for each side.
Lever for side 12:
Direction of FR on side 12: Choose direction v
Direction of FR on side 23: Choose direction v
Direction of FR on side 34: Choose direction v
Direction of FR on side 41: Choose direction v
Direction of t on side 12: Choose direction v
Direction of t on side 23: Choose direction v
Direction of t on side 34: Choose direction v
Direction of t on side 41: Choose direction v
Lever for side 23:
Lever for side 34:
Lever for side 41:
Transcribed Image Text:A Part 2: Torque on a wire loop Shown below-left is a square wire loop (the length of each side is L) that is set up to rotate about the central axis as shown. Below right, as viewed from the vantage point, are the upper side (side 12) & the lower side (side 34). The direction of the B-field being applied to the wire loop is also shown. The B-force on each side of the loop will be applied at each side's midpoint. [NOTE:I12 =I23 = 134 = l41. The subscripts are there to highlight the fact that they are going different directions.] Wire Loop View from vantage point of wires 12 & 34 VANTAGE POINT 141 1 12 12 A23 141 134 3 123 141 134 rotational axis Determine the lever, direction of force (as viewed from the vantage point), & direction of torque (as viewed from the vantage point) for each side. Lever for side 12: Direction of FR on side 12: Choose direction v Direction of FR on side 23: Choose direction v Direction of FR on side 34: Choose direction v Direction of FR on side 41: Choose direction v Direction of t on side 12: Choose direction v Direction of t on side 23: Choose direction v Direction of t on side 34: Choose direction v Direction of t on side 41: Choose direction v Lever for side 23: Lever for side 34: Lever for side 41:
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