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Complete the following statement: The magnetic field around a circular "loop" carrying a current is the...

Complete the following statement: The magnetic field around a circular "loop" carrying a current is the closest thing to:
a. Magnetic field of the Earth
b. Magnetic field of a magnetic short bar
c. Rectangular loop with current
d. A long stretched cable that carries current
and. Two long stretched cables that both carry currents in opposite directions

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Answer #1

Magnetic field associated with the Earth is due to the circulating current that arise due to circular motion of the ions in the core of the Earth. Hence the magnetic field associated with a circular coil carrying current resembles that of the Earth. Option a.

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