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According to ISO 764 or its equivalent DIN 8309 (Deutsches Institut für Normung - German Institute for Standardization) a watch must resist exposure to a direct current magnetic field of 4800 A/m. The watch must keep its accuracy to ±30 seconds/day as measured before the test in order to be acknowledged as a magnetic-resistant watch.
The first experiments were able to attain magnetic fields of millions of gauss (hundreds of teslas), given an initial field of 30 kG (3 T) which is in the free space "air" the same as H = B/μ 0 = (3 V s /m 2) / (4π × 10 −7 V s /Am) = 2.387 × 10 6 A/m (approximately 2.4 MA/m).
Microwave oven (30 cm or 1 ft away) [5] 10 −5 T 10 μT: 100 mG: 24 μT: 240 mG: Magnetic tape near tape head: 31 μT: 310 mG: Earth's magnetic field at 0° latitude (on the equator) 58 μT: 580 mG: Earth's magnetic field at 50° latitude: 10 −4 T 100 μT: 1 G: Magnetic flux density that will induce an electromotive force of 10 −8 volts in ...
front cover G1 1930. This is the Group G series List of the United States military vehicles by (Ordnance) supply catalog designation, – one of the alpha-numeric "standard nomenclature lists" (SNL) that were part of the overall list of the United States Army weapons by supply catalog designation, a supply catalog that was used by the United States Army Ordnance Department / Ordnance Corps as ...
The gauss is the unit of magnetic flux density B in the system of Gaussian units and is equal to Mx/cm 2 or g/Bi/s 2, while the oersted is the unit of H-field. One tesla (T) corresponds to 10 4 gauss, and one ampere (A) per metre corresponds to 4π × 10 −3 oersted.
In the CGS system, the unit of the H-field is the oersted and the unit of the B-field is the gauss. In the SI system, the unit ampere per meter (A/m), which is equivalent to newton per weber, is used for the H-field and the unit of tesla is used for the B-field. [3]
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