A Long Straight Cylindrical Shell Has an Inner Radius R_i

question 12

Multiple Choice

A long straight cylindrical shell has an inner radius R_i and an outer radius R_o.It carries a current i, uniformly distributed over its cross section.A wire is parallel to the cylinder axis, in the hollow region (r < R_i) .The magnetic field is zero everywhere outside the shell (r > R_o) .We conclude that the wire:

• A)is on the cylinder axis and carries current i in the same direction as the current in the shell
• B)may be anywhere in the hollow region but must be carrying current i in the direction opposite to that of the current in the shell
• C)may be anywhere in the hollow region but must be carrying current i in the same direction as the current in the shell
• D)is on the cylinder axis and carries current i in the direction opposite to that of the current in the shell
• E)does not carry any current

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Definitions:

Leakage

Any diversion of income from the domestic spending stream; includes saving, taxes, and imports.

Circular Flow

A model in economics that describes the movement of resources, goods and services, and money among different sectors in an economy.

Leakages-Injections Approach

An economic understanding and analysis of how savings, taxes, and imports (leakages) offset government spending, investments, and exports (injections) in the circular flow of income.

Value Added

The increase in worth of a product or service as a result of a particular process, often characterized by the difference between the price of the finished product and the cost of the inputs involved in making it.