The figure below shows two long, parallel wires in cross-section, and the currents they carry are directed out of the page. The left wire carries a current of I1 = 2.96 A,and the right carries a current of I2 = 3.50 A.The two wires are a distance          d =20.0 cm apart. Point P is the same distance d above the right wire.Assume the +x-direction is to the right, and the +y-direction is upward. What are the magnitude (in T) and direction (in degrees) of the net magnetic field due to the two wires at a point P? Measure the angle counterclockwise from the positive x-axis, with point P at the origin of the coordinate system. (Ignore the magnetic field due to the Earth.)

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A: (a) B = u0*I1/(2pi*a) = (4pi*10^-7*1.14)/(2pi*1*10^-3) = 228*10^-6 T = 228 uT upward

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Electromagnets

The word "electromagnet" is composed of two words, ‘electro’ and ‘magnet’. It is a type of magnet in which an electric current helps in the generation of a magnetic field. Electromagnets usually consist of two major parts, wire and a coil around which the wire is wound. This is called a solenoid. When an electric current is allowed to pass through the coiled wire, the electric current produces a magnetic field. This magnetic field is present only when current is passing through the wire.