Question

Chapter 18, Problem 09 A.

	Incorrect.

Two spherical objects are separated by a distance of 2.76 × 10^-3 m. The objects are initially electrically neutral and are very small compared to the distance between them. Each object acquires the same negative charge due to the addition of electrons. As a result, each object experiences an electrostatic force that has a magnitude of 1.09 × 10^-21 N. How many electrons did it take to produce the charge on one of the objects?

Number

Units

_____

Chapter 18, Problem 25

	Your answer is partially correct. Try again.

In the rectangle in the drawing, a charge is to be placed at the empty corner to make the net force on the charge at corner A point along the vertical direction. What charge (magnitude and algebraic sign) must be placed at the empty corner?

Number

I put, -3.286 but it is wrong

Units

C

C.

Chapter 18, Problem 39

	Your answer is partially correct. Try again.

A tiny ball (mass = 0.014 kg) carries a charge of -26C. What is the electric field magnitude that would cause the ball to float above the ground?

Number

______

Units

_____

the tolerance is +/-2%

Answer 1