A straight wire is causing a magnetic field, as shown. (The magnetic field circles the wire in a clockwise motion as viewed from the top.) What is the direction of the current? You do NOT need to show your work or explain your reasoning.

    What is the electric potential at point A in the figure? Show all of your work. 

    A metal rod A and a metal sphere B, on insulating stands, touch each other as shown. They are originally neutral. First, a positively charged rod is brought near (but not touching) the far end of A. Then, while the charged rod is still close, A and B are separated. Finally, the charged rod is then withdrawn.   At the end, the charge on the rod and sphere are _______________. You do NOT need to show your work or explain your reasoning.

In the previous question about the motion detector, how long does it take for a pulse that reflects off an object 5.5 m away to make a round trip? Show all of your work.

A 3.8 V potential difference is applied between the ends of a 0.55 mm diameter, 42 cm long wire. The wire is made of nichrome, which has a resistivity of 1.5 x 10-6 Ω∙m. What is the current in the wire? Show all of your work.

A pendulum is pulled to the side and released. The mass swings to the right as shown. The diagram shows positions for half of a complete oscillation. You do NOT need to show or explain your work for this question.     a. At which point or points is the speed the greatest? [parta] b. At which point or points is the speed zero? [partb] c. At which point or points is the potential energy the greatest? [partc] d. At which point or points is the kinetic energy the greatest? [partd]  

  A 3.25 m long string is fixed at both ends and tightened until the wave speed is 52.5 m/s.   a. What is the mode number? [mode] For parts b, c, and d, using three significant figures, type both the number and the units into the answer box. Show all of your work. b. What is the frequency of the standing wave shown in the figure? [frequency] b. What is its wavelength of the wave shown in the figure? [wavelength] c. What is its fundamental frequency? [fundamental]

Two identical loudspeakers 1.0 m apart are emitting 3170 Hz sound waves at room temperature. Kailea is standing 3.0 m in front of one of the speakers, perpendicular to the line joining the speakers. The point at which she is standing a point of [interference]. Show your work or explain your reasoning.

Two wave pulses on a string approach each other at speeds of 1 m/s, as shown above. How does the string look at t = 3 s? It is NOT necessary to show work or reasoning for this problem.

Which of the following explains the difference between type II and Type III hypersensitivity reactions?