A point charge Q is placed on the x axis at x = 2.0 m. A second point charge, -Q, is placed at x = 3.0 m. If Q = 40 mC, what is the magnitude of the electrostatic force on a 30-mC charge placed at the origin?

a. 7.2 N
b. 3.9 N
c. 1.5 N
d. 14 N
e. 8.1 N


C

Physics & Space Science

You might also like to view...

The position of an object that is oscillating on a spring is given by the equation x = (18.3 cm) cos[(2.35 s-1)t]. What are the (a) frequency, (b) amplitude, and (c) period of this motion?

What will be an ideal response?

Physics & Space Science

Waves on a String: A string of length L is under tension, and the speed of a wave in the string is v. What will be the speed of a wave in the string if the length is increased to 2L but with no change in the mass or tension?

A. v/2
B. v/
C. v
D. 2v
E. 4v

Physics & Space Science

The moon and visible planets are always within a few degrees of the ecliptic

Indicate whether the statement is true or false

Physics & Space Science

Electromagnetic induction occurs in a coil when there is a change in

A) electric field intensity in the coil. B) magnetic field intensity in the coil. C) electromagnetic polarity. D) none of the above

Physics & Space Science