Resistivity: a Wire of Resistivity ρ Must Be Replaced in a Circuit

question 20

Multiple Choice

Resistivity: A wire of resistivity ρ must be replaced in a circuit by a wire of the same material but 4 times as long. If, however, the resistance of the new wire is to be the same as the resistance of the original wire, the diameter of the new wire must be

• A) the same as the diameter of the original wire.
• B) 1/2 the diameter of the original wire.
• C) 1/4 the diameter of the original wire.
• D) 2 times the diameter of the original wire.
• E) 4 times the diameter of the original wire.

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Definitions:

Semiannual Interest

Semiannual Interest refers to interest that is calculated and paid twice a year, commonly found in bonds and other types of loans.

Fiscal Year

A one-year period that companies and governments use for financial reporting and budgeting, which may not coincide with the calendar year.

Accrued Interest

The interest that has been incurred but not yet paid on a loan or bond.

Fiscal Year

A 12-month period used for accounting and financial reporting purposes, which may or may not align with the calendar year.