Two Current Loops Are Coaxial and Coplanar

question 20

Multiple Choice

Two current loops are coaxial and coplanar. One has radius a and the other has radius 2a. Current 2I in the outer loop is antiparallel to current I in the inner loop. The magnitude of the magnetic field at the center of the two loops is

• A) 0.
• B) .
• C) .
• D) .
• E) .

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Definitions:

Allowance for Doubtful Accounts

A contra-asset account used to estimate the portion of a company's receivables that may not be collectible.

Bad Debt Expense

An expense reported on the income statement, representing the amount of non-collectible accounts receivable during a period.

Direct Write-off Method

An accounting method where bad debts are expensed only when they are deemed uncollectible.

Allowance Account

An account used to record adjustments for potential future losses or defaults on receivables, essentially reducing the value of accounts receivable to a more realistic figure.