The Current in a Long Wire Creates a Magnetic Field

question 100

Multiple Choice

The current in a long wire creates a magnetic field in the region around the wire.How is the strength of the field at distance r from the wire center related to the magnitude of the field?

• A)field directly proportional to r
• B)field inversely proportional to r
• C)field directly proportional to r²
• D)field inversely proportional to r²

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