Problem 6.A) What is an electromagnet? B) What causes the magnetic field ofthe earth? C) What causes the northern and southern lights?
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What causes the displays of lights called auroras? (Select all thatapply.)cold temperaturessolar disturbancesexcess sunlight focused through holes in the ozone layerthe recombination of ions and electrons in Earth's upperatmospheredisturbances in Earth's magnetic field
A large electromagnet has a 28 T magnetic field between its poles.What is the magnetic energy density between the poles?A) 310 J/cm^3 B) 390 J/cm^3 C) 110 J/cm^3 D) 49,000 J/cm^3
An electromagnet produces a magnetic field of 0.550 T in a cylindrical region of radius 2.50 cm between its poles. A straight wire carrying a current of 10.8 A passes through the center of this region and is perpendicular to both the axis of the cylindrical region and the magnetic field. What magnitude of force does this field exert on the wire?