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AP Physics 2
12.4 Electromagnetic Induction and Faraday’s Law
AdvancedMCQMathematicalProportional Analysis18k
A conducting rod sliding down vertical rails in a uniform magnetic field.
A conducting rod sliding down vertical rails in a uniform magnetic field.
Four conducting rods are placed on long, vertical, parallel, frictionless conducting rails in a uniform magnetic field of magnitude \(B\) directed perpendicular to the plane of the rails. Each rod-rail circuit has a different combination of rod mass \(m\), rod resistance \(R\), and rail separation distance \(L\), as shown in the table. Each rod is released from rest and accelerates downward until reaching its terminal velocity.

RodMassResistanceRail Separation
1\(m_0\)\(R_0\)\(L_0\)
2\(m_0\)\(2R_0\)\(L_0\)
3\(2m_0\)\(R_0\)\(L_0\)
4\(m_0\)\(R_0\)\(2L_0\)

Which of the following correctly ranks the rate of electrical energy dissipation \(P\) in the rods once each has reached its terminal velocity?

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