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Physics 126.Exam2A

# Physics 126.Exam2A - 1 The figure shows a uniform magnetic...

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1. The figure shows a uniform magnetic field that is normal to the plane of a conducting loop, which has a resistance R . Which one of the following changes will cause an induced current to flow through the resistor? A) decreasing the area of the loop B) decreasing the magnitude of the magnetic field C) increasing the magnitude of the magnetic field D) rotating the loop through 90° about an axis in the plane of the paper E) all of the above 2. A conducting bar moves to the left at a constant speed v= 1 m/s on two conducting rails in a constant magnetic field. The rails are joined at the left as shown. Originally the dimensions of the loop are height h = 0.25 m and length l =1 m. The induced emf of 0.5 V induces current in the direction indicated. Which of the following characterizes the magnetic field? A) 0.25 T out of the page B) 0.5 T out of the page C) 1 T into the page D) 2 T out of the page E) 2 T into the page Page 1

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I in the same direction as shown in the figure. If the current in the upper loop suddenly drops to zero, what will happen to the current in the lower loop according to Lenz's law? A) The current in the lower loop will decrease. B) The current in the lower loop will increase. C) The current in the lower loop will not change. D) The current in the lower loop will also drop to zero. E) The current in the lower loop will reverse its direction. 4. A single conducting loop with an area of 2.0 m 2 rotates in a uniform magnetic field so that the induced emf has a sinusoidal time dependence as shown. Determine the strength of the magnetic field in which the loop rotates.
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Physics 126.Exam2A - 1 The figure shows a uniform magnetic...

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