A current element (length = 1.0 cm) lies along the x axis with its center at x = 0 and carries a 20-A current in the positive x direction. Consider only the field of this current element and decide which combination of the following statements is correct. 1. The field at (0, 0, 1.0 m) is in the positive z direction. 2. The field at (0, 1.0 m, 0) is in the negative y direction. 3. The field at
(1.0 m, 0, 0) is zero. 4. The field at (0, 0, 1.0 m) is in the negative y direction.
a. 3 and 4
b. 1 and 3
c. 2 and 4
d. 1 and 2
e. None of these
A
You might also like to view...
A design requires a material that must have a high melting temperature, high stiffness, high compressive strength, low density, and low cost. Which of the following materials is most likely to best satisfy the design requirements?
(a) Alumina ceramic (b) Carbon steel (c) Polyethylene (d) Graphite-reinforced-epoxy composite
The Doppler effect states that the motion of any object can
a. shift the wavelength of spectral lines. b. change the speed of light emitted from the object. c. enhance the chemical composition of the object. d. make the object appear hotter. e. make the object appear cooler.
Which of the following best describes the lunar maria?
A) densely cratered regions on the Moon B) mountainous regions on the Moon C) frozen oceans of liquid water on the Moon D) relatively smooth, flat plains on the Moon
Suppose that you were selected for a "Survivor"-type TV show. To help keep your group connected, you suggest that long vines can be tied together and used to transmit signals in cases of emergency. To get the signals to travel faster, you should
A. select lighter vines. B. increase the tension on the vines. C. hang weights from the vines at evenly spaced intervals. D. do all of the above. E. do (a) or (b) above, preferably both.