At What Distance from a Long Straight Wire Carrying a Current

question 114

Multiple Choice

At what distance from a long straight wire carrying a current of $5.0 \mathrm {~A}$ is the magnitude of the magnetic field due to the wire equal to the strength of Earth's magnetic field of about $5.0 \times 10 ^ { - 5 } \mathrm {~T}$ ? $\left( \mu _ { 0 } = 4 \pi \times 10 ^ { - 7 } \mathrm {~T} \cdot \mathrm { m } / \mathrm { A } \right)$

• A) \(1.0 \mathrm {~cm}\)
• B) \(1.0 \mathrm {~mm}\)
• C) \(4.0 \mathrm {~cm}\)
• D) \(3.0 \mathrm {~cm}\)
• E) \(2.0 \mathrm {~cm}\)

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Definitions:

Tolerance

The allowable deviation from a standard measurement in the manufacturing process, determining how much a part can vary from a specified dimension.

Locational Transition Fits

A type of fit specifying a range wherein there may be either a slight interference or clearance between parts, used for parts requiring precise alignment.

Clearance

The amount of space or distance allowed between two parts for proper fit, function, or movement.

Interference Fits

A type of fit in mechanical engineering where two parts are so tightly fit together that they deform each other to stay in place.