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Contests/Gnit Weekly Challenge Advanced 001 (GWCA001)/Problem 1 Conducting rod moving on an inclined rail and electromagnetic induction
Problem 1

Conducting rod moving on an inclined rail and electromagnetic induction

Finished
100 ptsLv.6 IntermediateElectromagnetism
2026/07/29 21:00〜2026/07/29 22:00
Author: admin02

Problem Statement

Two smooth, parallel conductive rails are fixed at a distance L, inclined at an angle θ\thetaθ with respect to the horizontal plane. A resistor with resistance RRR is connected to the highest point of each rail. A uniform magnetic field (magnetic flux density BBB) is applied to the entire inclined plane formed by the rails, perpendicular to the incline and directed upward.

A conducting rod of mass mmm is placed on these rails perpendicular to the rails and released gently. The conducting rod slides down the incline along the rails. Assume that the resistance of the conducting rod and rails, the self-inductance of the circuit, and air resistance are all negligible, and the magnitude of the acceleration due to gravity is ggg.

After a sufficient amount of time has elapsed since the release of the conducting rod, it begins to move in a straight line at a constant velocity vvv. Find the algebraic expression for the magnitude of this velocity vvv.

Constraints

  • m=0.200 kgm = 0.200 \text{ kg}m=0.200 kg
  • g=9.80 m/s2g = 9.80 \text{ m/s}^2g=9.80 m/s2
  • θ=30.0∘\theta = 30.0^\circθ=30.0∘
  • R=4.00 ΩR = 4.00 \text{ }\OmegaR=4.00 Ω
  • B=0.700 TB = 0.700 \text{ T}B=0.700 T
  • L=1.00 mL = 1.00 \text{ m}L=1.00 m

Input Format

Calculate the magnitude of the velocity of the conducting rod v [m/s]v \text{ [m/s]}v [m/s] after a sufficient amount of time has elapsed, and input a natural number representing that value.

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