Question

At a certain moment in time, two identical, positively charged particles are flying horizontally toward each other. Let the xx-axis be the axis along which the particles are moving, and let the origin lie directly between both particles. Let the yy-axis be oriented pointing vertically up and the zz-axis point directly out from the origin.

1) Which combination of options below are the best combination of corrections that you might make to your friend's diagram? [Enter your answer as a string of the letter options you believe are correct. For instance, if you think options A, D, and E are correct, then enter "ADE"]

A) The particles exert no magnetic forces on each other.
B) The total magnetic field at positions equidistant from each particle is zero.
C) The total magnetic field at points vertically above the positive xx-axis point in the negative zz direction.
D) The total magnetic field at points vertically below the negative xx-axis point in the positive zz direction.
E) None of the above

Two positively charged particles are travelling through space in each others' vicinity. Using the standard xx-yy-zz coordinate grid, particle 1 travels along the positive xx direction while particle 2 travels along the positive yy direction, heading directly for the first particle from below.

3) Which combination of options below are the most accurate combination of statements. [Enter your answer as a string of the letter options you believe are correct. For instance, if you think options A, D, and E are correct, then enter "ADE"]

A) Particle 1's magnetic field at particle 2's location points down along the yy-axis.
B) Particle 2 feels a magnetic force pushing in the negative xx direction.
C) Particle 2's magnetic field at the location of particle 1 is zero.
D) Particle 1 feels a magnetic force pushing out in the positive zz direction.
E) None of the above

A loop of copper (a conducting material) is carried across a region of space with a non-zero uniform magnetic field so that the area surrounded by the loop is perpendicular to the field direction. Imagine the situation is oriented so that the magnetic field is coming out of the screen toward you, and the loop is being pulled toward the right.

11) Which combination of options below is most accurate? [Enter your answer as a string of the letter options you believe are correct. For instance, if you think options A, D, and E are correct, then enter "ADE"]

A) The magnetic flux through the loop is zero.
B) There is no induced current in the loop.
C) A current would not be induced if the field were not uniform.
D) Nothing would be changed by turning the loop around.
E) None of the above

Answer 1