An electron (negative charge), a proton (positive charge), and a neutron (no charge) walk into a bar with the same speed. If there is a uniform magnetic field in the bar, from the ceiling to the floor, sketch the path of these three particles in the bar.

As shown in the figure, a long, hollow, conducting cylinder of inner radius a and outer radius b carries a current that is flowing out of the page. Suppose that a = 4.93 cm, b = 7.93 cm, and the current i = 103 mA, uniformly distributed over the cylinder wall (between a and b). Find the magnitude of the magnetic field at each of the following distances r from the center of the cylinder:  a)r = 6.39 cm.  b) r = 9.25 cm.

A long straight wire carries a 1.5 A current. An electron moves parallel to the wire at speed 1.3 x 104 m/s. The distance between the electron and the wire is 7 cm. Calculate the magnitude of the magnetic force on the electron.(Give your answer in newtons. Don't round your answer.)

Two very long, parallel wires are separated by a distance of 2 m. The top wire carries a current of 16 A flowing to the left. Point x lies between the wires, 0.4 m below the top wire (see figure below).  (a) What is the strength of the magnetic field at point x due to the top wire? For part (a) and (b) you may assume no current is flowing in the bottom wire.  (b) What is the direction of the magnetic field at point x due current flowing in the top wire? (Give your answer in terms of toward the top, bottom, left side, right side, into, or out of the page.)  (c)  What current must flow through the bottom wire to have the net (total) magnetic field be zero at point x? Specify both the magnitude and the direction of the current.

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?

Each of the figures below shows a charged particle (with the charge sign indicated on each particle) moving from a region of zero magnetic field to a region of uniform magnetic field B. For each case, find the initial direction in which the charged particle is deflected (if any) as it enters the magnetic field. (a) Bin х х х х х х х * x x x O up O down O to the right O to the left O into the page O out of the page O no deflection (b) Bup O up O down O to the right O to the left O into the page O out of the page O no deflection (c) Bright up O down O to the right O to the left O into the page O out of the page O no deflection (d) Bat 45 450 O up O down O to the right O to the left O into the page O out of the page O o o

An electron moves in a uniform circular motion under the action of an external magnetic field. -19 Consider the charge of the electron 9 = -1.6 × 10- v = 2.8 X 107 [C], the speed of the electron B = 2.1 x 10-³ [m/s] and the magnitude of the external magnetic field [T]. Calculate the radius R of the circle formed by the electron during its displacement. Write your answer in centimeters and round to the first decimal.

A bubble chamber is a vessel with a uniform magnetic field running through it filled with a superheated transparent liquid (most often liquid hydrogen) used to detect electrically charged particles moving through it. It was invented in 1952 by Donald A. Glaser, for which he was awarded the 1960 Nobel Prize in Physics. Here is a photograph obtained in a bubble chamber, showing various charges circling around because of the magnetic field: Which of the following statements is false? Hint: Use the formula you found in the last question to help you with this question. Particles with positive charge will circle in one direction (perhaps clockwise) while particles of negative charge will circle in the opposite direction (perhaps counterclockwise). Heavier charges would have a larger radius of curvature, Particles with a larger charge would have a larger radius of curvature. Faster particles would have a larger radius of curvature. Increasing the magnetic field strength in the bubble chamber…

Which describes the net force on a magnetic dipole in a uniform magnetic field? The net force vector is in the direction of the magnetic field. O The net force vector is in the direction opposite that of the magnetic field. The net force vector is perpendicular to the direction of the magnetic field. O The net force vector is zero.