In the Drawing, a Coil of Wire Is Wrapped Around

question 19

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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Average Revenue

The amount of money a firm earns per unit of output sold, calculated by dividing total revenue by the quantity sold.

Marginal Cost

The increase or decrease in the total cost that arises when the quantity produced is incremented by one unit.

Average Total Cost

The total cost of production (fixed and variable costs combined) divided by the total quantity produced.

Total Revenue

The overall income obtained by an enterprise from its sales or services within a designated period.