1) A long, straight solenoid with a cross-sectional area of 8.00 cm 2 is wound with 90 turns of wire per centimeter, and the windings carry a current of 0.350
A. A second winding of 12 turns encircles the solenoid at its center. The current in the solenoid is turned off such that the magnetic field of the solenoid becomes zero in 0.0400 s. What is the average induced emf in the second winding?
2) A group of particles is traveling in a magnetic field of unknown magnitude and direction. You observe that a proton moving at 1.50 km/s in the +x-direction experiences a force of 2.25x10- 16 N in the +y-direction, and an electron moving at 4.75 km/s in the -z-direction experiences a force of 8.50 X 1O- 16 N.
(a) What are the magnitude and direction of the magnetic field?
(b)What are the magnitude and direction of the magnetic force on an electron moving in the -y direction at 3.2 km/s?