(a) When the loop is in position 1, i. What is the magnetic dipole moment of the loop? What is the magnetic torque on the loop? ii. (b) When the loop is in position 2, i. What is the magnetic dipole moment of the loop? ii. What is the magnetic torque on the loop? (c) What is the change in magnetic potential energy when the loop is moved from position 1 to position 2?

19. A square conducting loop of side a and resistance R passes through a region of space that has uniform magnetic field B into the page, as shown in the figure. Assume that the speed of the loop is constant throughout its motion. What is the magnitude and direction of the current in the loop: as it enters the magnetic field, a) b) while travelling inside the magnetic field, as it leaves the magnetic field. Provide your answer symbolically. a V Ø 8 Ø Top view Uniform magnetic field pointing into the page

A solenoid is wound on a rod 4 cm in diameter in 50 cm long. The windings carry a current of 3.5 A in the sense that is shown. The current produces a magnetic field of magnitude 4.1 mT at the center of the solenoid. The number of turns in the solenoid is closest to which? A. 4700 B. 3700 C. 470 D. 1900 E. 19

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