Potential Energy: Two tiny grains of sand having charges of 4.0 ?C and -4.0 ?C are situated along the x-axis at x1 = 2.0 m and x2 = -2.0 m. What is electric potential energy of these grains relative to infinity? (k = 1/4??0 = 9.0 × 109 N ? m2/C2)
A. -36 mJ
B. 36 mJ
C. 0 J
D. -72 mJ
E. 72 mJ
Answer: A
You might also like to view...
The pressure of a substance is directly proportional to its volume when the temperature is held constant and inversely proportional to its temperature when the volume is held constant. Is this substance an ideal gas? Explain why your answer is correct.
What will be an ideal response?
An electron vibrating to and fro 1000 times per second generates an electromagnetic wave having a
A) period of 1000 s. B) speed of 1000 m/s. C) wavelength of 1000 m. D) frequency of 1000 Hz.
The increase of potential energy of the box is 100 J
Indicate whether the statement is true or false
In one experiment showing that faster-moving objects have larger masses,
A) high-velocity rifle bullets are fired at targets and their impact is measured. B) high-speed microscopic particles pass through electromagnetic fields, and the bending of their path is measured. C) a microscopic balance-beam is used to measure the speeds of particles emitted during radioactive decay. D) observers move along beside high-velocity rifle bullets, in order to measure the masses of the bullets. E) microscopic particles are released from rest in a gravitational field, and their acceleration is measured.