A circular copper disk of radius 7.5 cm rotates at 2400 rpm around the axis through its center and perpendicular to its face. The disk is in a uniform magnetic field B → of strength 1.2 T that is directed along the axis. What isthe potential difference between the rim and the axis of the disk?

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An electron enters a region of space containing a uniform 2.89 × 10-³ T magnetic field. Its speed is 163 m/s and it enters perpendicularly to the field. Under these conditions, the electron undergoes circular motion. Find the radius r of the electron's path and the frequency f of the motion. r = m %3D Hz

Suppose you wish to produce a 2-T magnetic field in a toroid with an iron core for which magnetic susceptibility is x=3 x 10³. The toroid has a mean radius of 18 cm and is wound with 600 turns. Hint с a. What current is required to produce this magnetic field in the iron core? Current of A is needed. b. For comparison, what current is required to produce the same magnetic field in an air-filled toroid of same geometry? Current of While it is not always practical to have region of magnetic field filled with ferromagnetic materials, this dramatic increase in strength of magnetic field produced is useful in some applications you will see in upcoming chapters. Submit Question 4 A is needed for toroid with no iron core. % Search or type URL 5 MacBook Pro < 6 A 6 7 * 8 ( 9