Electric Field of Point-Charges: The figure shows two unequal charges, +q and -Q. Charge -Q has greater magnitude than charge +q. Point X is midway between the charges. In what section of the line will there be a point where the resultant electric field is zero?
A. VW
B. WX
C. XY
D. YZ
Answer: A
You might also like to view...
The internal energy of n moles of an ideal gas depends on
a. one state variable T. b. two state variables T and V. c. two state variables T and P. d. three state variables T, P and V. e. four variables R, T, P and V.
A flywheel is used to minimize changes in rotational velocity as the torque or the load changes. The rotational inertia of a flywheel should be chosen to be
A. as small as possible. B. as large as possible. C. anything-it doesn't matter.
If you shine a flashlight from one wall to an opposite wall inside a spaceship drifting without acceleration far from gravitational influences, the beam of light will travel
A) in a straight-line path. B) in a parabolic path. C) along the arc of a circle.
Cosmic inflation caused the universe to expand, for a brief period, at faster than lightspeed. But special relativity says that nothing can move faster than lightspeed. How can this contradiction be resolved?
A) The laws of physics (conservation of energy, special relativity, etc.) as we presently know them were not valid during the "inflationary period" that existed for a fraction of a second into the big bang. B) We now realize that special relativity does not apply to dark energy. C) Special relativity says nothing can move through space at faster than lightspeed, but doesn't restrict the speed at which space can expand. D) It hasn't yet been resolved, but scientists are working on resolving it. E) The laws of specially relativity were not valid during the inflationary period, but the other laws (such as conservation of energy) were valid.