A 150 g ball containing 4.00 x 10° excess electrons is dropped into a 125 m vertical shaft. At the bottom of the shaft, the ball suddenly enters a uniform horizontal magnetic field that has magnitude 0.250 T and direction from east to west. Considering the air resistance is negligibly small: (a) Find the speed at the bottom of the shaft. (b) Find the magnitude of the force that this magnetic field exerts on the ball just as it enters the field. Select one: V = 49.5 m/s, F = 3.25 x 10 10 N V = 1.15 m/s, F= 3.25 x 10 10 N V = 15.4 m/s, F = 2.13 x 10 10 N V = 15.4 m/s, F= 7.93 x 10 10 N v = 49.5 m/s, F = 7.93 x 10-10 N V = 15.4 m/s, F = 3.25 x 10 10 N

Electrons starting from rest are accelerated through a potential difference of 240 V and fired into a region of uniform 3.5-mT magnetic field generated by a large solenoid. The electrons are initially moving in the +x-direction upon entering the field, and the field is directed into the page. Determine (a) the radius of the circle in which the electrons will move in this uniform magnetic field and (b) the initial direction of the magnetic force the electrons feel upon entering the uniform field of the solenoid.

In a mass spectrometer, the mass of a particle is determined by it's circular path in a magnetic field of value B= 1T. Here, we consider a particle of charge q=te = 1.6 x 10"C that is accelerated across a potential difference AV :- 500 Volts. As shown, this particle enters a chamber with a uniform magnetic field. The particle makes a circular path and strikes the detector a distance I=8 Cm from where it entered the chamber. Part A Determine the mass of the particle. Vo AEO m 3= kg

An electron in the beam of a cathod-ray tube is accelerated by a potential difference of 2.14 kV . Then it passes through a region of transverse magnetic field, where it moves in a circular arc with a radius of 0.190 m . What is the magnitude of the field?