A charge -q is far away from a charge -Q which is fixed in place. As -q moves closer to -Q, the work done by the electric field is
A. positive.
B. negative.
C. zero.
B. negative.
You might also like to view...
The significance of a Carnot engine is that
A. all automobiles operate on the Carnot cycle B. it has the maximum possible efficiency of any engine operating between the same two temperatures C. it violates the second law of thermodynamics D. it violates the first law of thermodynamics
Addition by 1. Components: Vector src="https://sciemce.com/media/4/ppg__cp1pbb0313192044__f15g1q20g6.jpg" style="vertical-align: -5.0px;" /> is given by
A. 2.0 m at an angle 63° north of east.
B. 2.0 m at an angle 63° east of north.
C. 6.7 m at an angle 63° east of north.
D. 6.7 m at an angle 63° north of east.
E. 3.8 m at an angle 67° north of east
has a magnitude of 8.0 m and points east, vector 
has a magnitude of 6.0 m and points north, and vector 
has a magnitude of 5.0 m and points west. The resultant vector 
+ 
+
What do we mean when we say that the Sun is in energy balance?
A) The amount of energy released by fusion in the Sun's core equals the amount of energy radiated from the Sun's surface into space. B) The Sun maintains a steady rate of energy output into space. C) The inward force of gravity balances the outward push of pressure. D) The amount of energy contained in the Sun's magnetic field is in balance with the amount of energy going into solar activity such as sunspots and solar flares.
What is the fate of an open universe?
a. Expansion forever b. Eventual collapse c. Gradual halt to the expansion d. Can't be known without density information.