A conducting bar of mass \(m\), length \(L\), and resistance \(R\) slides down frictionless parallel conducting rails inclined at an angle \(\theta\) to the horizontal. The top ends of the rails are connected by a resistor of negligible resistance to form a closed loop, and a uniform magnetic field \(\vec{B}\) is directed vertically upward through the plane of the rails. The bar reaches a constant terminal speed \(v_T\) as it slides down the incline. Which of the following statements correctly predicts and justifies the change in the terminal speed if the magnitude of the magnetic field is doubled to \(2B\)?