Terminal velocity

A system of long, parallel conducting rails is set up in the vertical plane and joined at both the ends by resistors as shown in the figure. A uniform magnetic field exists perpendicular to the plane of the rails denoted by B \vec{B} . A rod whose length is equal to the separation between the rails is allowed to fall freely and attain a terminal velocity. If the powers dissipated by the resistors R1R_1 and R2R_2 at steady state are 0.76 W0.76 \text{ W} and 1.2 W,1.2\text{ W}, respectively, then what is the terminal velocity of the rod?

Details and Assumptions

  • The length and mass of the rod are 1 m and 0.2 kg.
  • The acceleration due to gravity is 9.8 m/s29.8\text{ m/s}^2.
  • The magnitude of the magnetic field is 0.6 T.
  • The rails are long enough so that the steady state conditions can be easily analysed.
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