Electric Field of Point-Charges: The electric field at point P due to a point charge Q a distance R away from P has magnitude E. In order to double the magnitude of the field at P, you could
A. double the distance to 2R.
B. double the charge to 2Q.
C. reduce the distance to R/2.
D. reduce the distance to R/4.
E. double the charge to 2Q and at the same time reduce the distance to R/2.
Answer: B
You might also like to view...
The magnetic forces exerted on each other by two parallel wires with unequal currents flowing in opposite directions is
A. repulsive and unequal in magnitude. B. attractive and unequal in magnitude. C. repulsive and equal in magnitude. D. attractive and equal in magnitude.
An object 2 cm high is placed 10 cm in front of a mirror. What type of mirror and what radius of curvature is needed for an image that is inverted and 4 cm tall?
a. Concave, R = 40 cm c. Convex, R = 13 cm b. Convex, R = 6.7 cm d. Concave, R = 20 cm
Complex molecules in the interstellar medium are found
A) only around the supergiant stars like Betelgeuse that make their heavy atoms. B) uniformly throughout the disk of the Galaxy. C) primarily in the dense dust clouds. D) scattered evenly throughout the universe, a product of the Big Bang itself. E) on the surfaces of the coolest class K and M stars only.
Two cars crash head on. At any given time during the crash, the magnitudes of the collision forces exerted on each car are exactly equal. This is an example of Newton's
a. first law. b. second law. c. third law. d. no law.