The magnitude of the magnetic field produced by a long, straight wire is proportional to the current passing through the wire and inversely proportional to the distance from the wire. Consider the five pairs of long, parallel wires shown. The arrows indicate the direction of the current in each wire, with small arrows representing a current of 5 A and large arrows representing a current of 6 A. For each pair, determine in which one of the regions the net magnetic field is zero someplace: on the left of both wires between the two wires on the right of both wires none of the above (i.e., nowhere) Do not consider distances very far from the wires since in this case the magnetic field always goes to zero. Left Between Right Nowhere

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Students often get confused between Wien's displacement law and Planck's radiation law. Although both are historically related, yet they are conceptually different. Planck's law helps determine the spectrum of a blackbody, while Wien's law determines the relationship between peak wavelength and temperature.