Acompass originally points north; at this location the horizontal component of the earth's magnetic field has a magnitude of 2e-5 t. a bar magnet is aligned east-west, pointing at the center of the compass. when the center of the magnet is 0.26 m from the center of the compass, the compass deflects 70 degrees. what is the magnetic dipole moment of the bar magnet?

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.