An electron moving in the positive x direction experiences a magnetic force in the positive z direction. If Bx = 0, what is the direction of the magnetic field?
A. negative y direction
B. positive y direction
C. negative z direction
D. positive z direction
E. negative x direction
Answer: A
You might also like to view...
The Milankovitch cycles are
What will be an ideal response?
A coaxial cable has an inner cylindrical conductor surrounded by cylindrical insulation and an outer cylindrical conducting shell. The outer shell carries the same current but in the opposite direction from that in the inner conductor as shown. If the coaxial cable sits in a uniform magnetic field directed upwards with respect to the cable, the effect of the field on the cable is
A. a net force to the left. B. a net force to the right. C. a net force upwards. D. no net force but a slight shift of the inner conductor to the left and the outer conductor to the right. E. no net force but a slight shift of the inner conductor to the right and the outer conductor to the left.
When a transparency sheet is rubbed with a tissue and the transparency and tissue are then held at rest a short distance apart,
A) the transparency and the tissue exert magnetic forces on each other, because the electron orbits in the two objects are all put into the same alignment. B) the two objects exert electric forces on each other, because electrons are rubbed off of one and onto the other. C) the two objects exert magnetic forces on each other, because electrons are rubbed off of one and onto the other. D) a spark will jump between them, because the rubbing causes electrons to jump from one object to the other. E) the two objects exert electric forces on each other, because the electron orbits in the two objects are all put into the same alignment.
A hydrogen atom in the ground state absorbs a 13.32-eV photon. To what level is the electron promoted? (The ionization energy of hydrogen is 13.6 eV)
a. n = 6 b. n = 10 c. n = 7 d. n = 5 e. n = 11