An infinitesimal current element located at the origin (x, y, z) = (0, 0, 0) carries current I in the positive y direction. At which of the following locations is the magnetic field due to this current element the smallest?

1) x=L, y=0, z=02) x=0, y=L, z=03) x=0, y=L, z=L4) x=0, y=0, z=L5) x=L, y=0, z=L6) x=L, y=L, z=0

Two objects of different mass start from rest, are pulled by the same magnitude net force, and are moved through the same distance. the work done on object 1 is 900 j. after the force has pulled each object, object 1 moves twice as fast as object 2. how much work is done on object 2?

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At 20∘c, the hole in an aluminum ring is 2.800 cm in diameter. you need to slip this ring over a steel shaft that has a room-temperature diameter of 2.804 cm . 1. to what common temperature should the ring and the shaft be heated so that the ring will just fit onto the shaft? coefficients of linear thermal expansion of steel and aluminum are 12×10−6 k−1 and23×10−6 k−1 respectively.