In the Drawing,a Coil of Wire Is Wrapped Around a Cylinder

question 44

Multiple Choice

In the drawing,a coil of wire is wrapped around a cylinder from which an iron core extends upward.The ends of the coil are connected to an ac voltage source.After the alternating current is established in the coil,an aluminum ring of resistance R is placed onto the iron core and released.Which one of the following statements concerning this situation is false?

• A)The induced current in the ring is an alternating current.
• B)The temperature of the ring will increase.
• C)At any instant,the direction of the induced current in the ring is in the same direction as that in the coil.
• D)The induced magnetic field in the ring may by directed either upward or downward at an instant when the direction of the magnetic field generated by the current in the coil is upward.
• E)The ring may remain suspended at the position shown with no vertical movement of its center of mass.

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