Imagine four equal positive charges, q, placed on points of a circle of radius r at the 3, 6, 9, and 12 o'clock positions. Coulomb's constant is k. The magnitude of the electric field at the center of the circle is given by
A. 4 kq/r.
B. 4 kq/r2.
C. kq/r2.
D. kq/r.
E. zero.
Answer: E
You might also like to view...
The total number of comets orbiting the Sun is estimated to be about
A) 1 trillion. B) 1,000. C) 100,000. D) 1 million.
The electric energy density in an electromagnetic wave is higher than its magnetic energy density
Indicate whether the statement is true or false
Which of the following objects do you expect to find at the center of a planetary nebula?
A. neutron star B. planet C. black hole D. white dwarf
It is difficult to see the roadway when driving on a rainy night mainly because
A) light scatters from raindrops and reduces the amount of light reaching your eyes. B) of additional condensation on the inner surface of the windshield. C) the film of water on your windshield provides an additional reflecting surface. D) the film of water on the roadway makes the road less diffuse. E) none of the above