The diagram depicts a wire of length L that is suspended from two wire springs o
ID: 1717082 • Letter: T
Question
The diagram depicts a wire of length L that is suspended from two wire springs of spring constant k. The system is connected to a direct current source. A magnetic field B, out of the page and perpendicular to the wire, is turned on. Then the current I is turned on; the wire will move to a new equilibrium position. The wire is free to move in 3 dimensions.
For each of the following statements answer True, False, or Cannot tell. E.g., if the first statement is true, the second is false, and there is not enough information to answer the rest, enter TFCCC.
(ANSWER IS NOT: T F F F T )
i) For the situation depicted in the diagram, the wire will move down to a new equilibrium position.
ii) If the direction of the magnetic field were down (in the plane of the page), the wire would not move to a new equilibrium position.
iii) If the current direction were reversed from that shown on the diagram, the wire would move up to a new equilibrium position.
iv) If the direction of the magnetic field were parallel to the current in the wire of length L, the wire would not move to a new equilibrium position.
v) If the direction of the magnetic field were into the page, the wire would move up to a new equilibrium position.
Explanation / Answer
(i) F= force on wire = ILB, down ward direction
Wire will move in downward direction, True
(ii) Force on wire is into plane the plane, False
(iii) Force is upward, true
(iV) force=0, wire will not move
(V) force upward direction, wire will move in upward, true