A chunk of iron is not usually magnetic, because A. the B fields of the atoms all line up B. the B fields of the atoms are randomly oriented, and cancel out C. its atoms do not have a B field D. electrons cannot move in its atoms

A charge particle is undergoing uniform circular motion due to a constant magnetic field. Which of the following will increase the radius of the particle's circular path? A. decreasing its mass B. increasing its charge C. decreasing the magnitude of the ratio of its mass to charge D. increasing the magnitude of the ratio of magnetic field strength to speed E. decreasing the magnetic field strength.

What happens when you break a bar magnet in two? a.You get two separate poles. One piece will be the north pole, the other will be the south pole. b.You get two bar magnets. Each has a north and south pole. c. The poles discharge. The act of breaking the magnet allows the magnetic charge to move so as to cancel each other out the same way protons can cancel electrons with electric charge. d. You cannot have a magnet without two poles, so the pieces will no longer be magnetic.

A student performs the experiment on Magnetic Field Lines and sketches the patterns formed by the iron filings around bar magnets. Which of the following sketches are possibly from the student's observations? I. II. S N S N III. S A. I and III only B. II and IV only N N S C. I, II, and III D. I, III, and IV IV. N N S IN E. I, II, III, and IV 161

2) region of uniform magnetic field B, that is vertically downward. Give your answers in terms of e, m, B, v and n. a) Calculate the magnetic force F (Magnitude and direction) acting on the proton. b) Calculate the time t at which the proton's velocity will be directed westward the first time in its At time t = 0 a proton is projected with an initial velocity v, horizontally northward in a travel. W- -E proton

The diagram below shows two, thin, infinitely-long, parallel conducting wires that are separated by a perpendicular distance of 2.0 cm. What is the coordinate on the y-axis where the total magnetic field is zero?     a. y = 4.8 cm   b. y = 5.6 cm   c. y = 4.4 cm   d. y = 6.6 cm   e. y = 5.2 cm

What is the direction of the magnetic force exerted on a proton moving in positive X- direction through a magnetic field in the negative Z- direction. Select one: O a. Z. O b. + Y. O C. Y. O d. + X.

Which of the following activities would lead to the creation of magnetic fields?    select as many as are correct. a.Placing an electron in an environment where it is moving at 7 m/s around a circular path b.Placing a negative ion in an environment where it has a nonzero acceleration that is constantly changing c.Placing the nucleus of an atom in an environment where it has zero acceleration and a zero velocity d.Placing a proton in an environment where it is completely at rest e.Placing the nucleus of an atom in an environment where it is moving at constant velocity

5. A current through a wire is in the +x direction in the presence of an external magnetic field that points in the +y direction. In what direction does the magneitc force on the wire point?

Two current-carrying conductors are parallel to one another. The first wire has a current of 36 A flowing in the southern direction while the other wire has a 60-A current flowing in northern direction. The conductors are 0.009 m apart. What is the direction of the net magnetic field on a point between the two conductors?    A. North B.South C.Into the page D.Out of the page