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what is the difference between tesla and oersted???

The unit of auxillary magnetic field H in CGS is Oersted. 
The unit for magnetic field B in SI is Tesla.
The relationship between the two can be established from :
10,000 Oersted = 1 Tesla
Both are the units to calculate magnetic field.

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The oersted is defined as adyneperunit pole.[citation needed]The oersted is 1000/4 (≈79.5774715) amperes per meter, in terms ofSI units.[3][4][5][6]

The H-field strength inside a longsolenoidwound with 79.58 turns per meter of a wire carrying 1Ais approximately 1 oersted. The preceding statement is exactly correct if the solenoid considered is infinite in length with the current evenly distributed over its surface.

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