Question

In: Physics

A thin copper rod has a mass per unit length of 0.1 kg/m. What is the...

A thin copper rod has a mass per unit length of 0.1 kg/m. What is the minimum current in the rod that would allow it to levitate above the ground in a magnetic field of magnitude 0.5 T? (g = 10.0 m/s2)
  1. 2.9 A
  2. 2.5 A
  3. 2.2 A
  4. 2.0 A
  5. 1.8 A

Solutions

Expert Solution

The entire question isn't visible in the frame, so I'm assuing that the magnetic field is perpendicular to the direction of the current flow and solving the question accordingly. As the rod levitates above the ground in the presence of magnetic field, so the magnetic force must balance the weight of the rod and for magnetic force there must be a current. So by equating both of the forces we can easily calculate the current.​​​​​​​

genius_generous answered 2 years ago
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