A metal bar slides to the right under the action of an external force Fext, on a pair of parallel rails, without friction and conductors placed in a horizontal plane. The rails are separated by a distance L and are connected by a resistor R. We will assume that the resistance of the rails and the rod is negligible. The system is placed in a region with a uniform magnetic field B perpendicular to the page, and the induced current in the rod is observed to be directed down the page. a) If the rod is to slide with constant speed to the right, what must be the direction of the magnetic field B? b) If Fext = 10 N, R = 2ohm, L = 50 cm and v = 5 m / s, calculate the magnitude of the magnetic field to be applied. c) If now the external force is applied to the left and the rod moves to the left with the same speed, maintaining the same magnitude and direction of the magnetic field, in which direction does the induced current in the rod now go
A metal bar slides to the right under the action of an external force Fext, on a pair of parallel rails, without friction and conductors placed in a horizontal plane. The rails are separated by a distance L and are connected by a resistor R. We will assume that the resistance of the rails and the rod is negligible. The system is placed in a region with a uniform magnetic field B perpendicular to the page, and the induced current in the rod is observed to be directed down the page.
a) If the rod is to slide with constant speed to the right, what must be the direction of the magnetic field B?
b) If Fext = 10 N, R = 2ohm, L = 50 cm and v = 5 m / s, calculate the magnitude of the magnetic field to be applied.
c) If now the external force is applied to the left and the rod moves to the left with the same speed, maintaining the same magnitude and direction of the magnetic field, in which direction does the induced current in the rod now go?
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