* Which of these is true about the electrical field lines of point charge?
A. Electric field lines leave positive charges and enter positive charges.
B. Electric field lines leave negative charges and enter negative charges.
C. Electric field lines leave positive charges and enter negative charges.
D. Electric field lines leave negative charges and enter positive charges.

Which lists the main components of darwin’s theory of evolution? a. random mutations drive evolution; the evolution of a population happens slowly; organisms have common ancestors; organisms do not change. b. natural selection drives evolution; the evolution of a population happens slowly; organisms have common ancestors; organisms change over time. c. natural selection drives evolution; the evolution of a population happens rapidly; organisms have common ancestors; organisms change over time. d. random mutations drive evolution; the evolution of a population happens rapidly; organisms have common ancestors; organisms do not change.

What can you increase the strength of an electromagnet by

Determine the moment of the force f about an axis extending between a and c. express the result as a cartesian vector. a is at the origin, c is at (4,3,0) and f = (4i + 12j -3k) lb coming out of b (4,3,-2).