The aluminum (2.7 x 10-8 Ω∙m) wire in a high-voltage transmission line is 2.4 cm in diameter. It is designed to carry a current of 1250 A. What is the voltage drop across a 28 km long segment of this power line? Show all of your work. 

In the previous question, with the two narrow slits, what is the angle (in degrees) between the central maximum and the m = 1 bright fringe? Show all of your work.

In the previous question, what is the direction of the net electric force on the 1.0 nC charge at the bottom of the figure? [answer]

Find the current through and potential difference across each resistor in the figure. The resistors are labeled 1 to 5, according to how they are listed in the table below. Place both the value and units into the answer boxes. Show all of your work for every step.      Resistor R I

    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 Finally, the charged rod is then withdrawn.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]