Physics Chapter 19

A piece of plastic has a net charge of +2.00 μC. How protons does this piece of plastic have? (e = 1.60 × 10-19 C) 1.25 × 10^13 1.25 × 10^19 2.50 × 10^13 2.50 × 10^19 3.01 × 10^23

1.25 × 10^13

Two point charges each experience a 1-N electrostatic force when they are 2 cm apart. If they are moved to a new separation of 8 cm, what is the magnitude of the electric force on each of them? 2 N 1/2 N 1/4 N 1/8 N 1/16 N

1/16 N

Two tiny particles carrying like charges of the same magnitude are 0.001m apart. If the electric force on one of them is what is the magnitude of the charge on each of these particles?(k = 8.99 × 109 N • m2/C2) 2.4 × 10^-2 C 2.4 × 10^-8 C 4.5 × 10^4 C 2.4 × 10^-5 C

2.4 × 10^-8 C

The force of attraction that a -40.0 μC point charge exerts on a +108 μC point charge has magnitude 4.00 N. How far apart are these two charges? (k = 8.99 × 109 N • m2/C2) 2.10 m 3.67 m 3.12 m 2.49 m 1.13 m

3.12 m

If a charge generator builds a negative static charge of - how many electrons are transferred to it during this process. (e = 1.60 × 10-19 C) 4.38 × 10^13 7.0 1.12 × 10^-18 43.8

4.38 × 10^13

How many electrons are necessary to produce 1.0 C of negative charge? (e = 1.60 × 10-19 C) 6.3 × 10^18 6.3 × 10^9 1.6 × 10^19 1.6 × 10^9 6.0 × 10^23

6.3 × 10^18

What is the charge on 1.0 kg of protons?(e = 1.60 × 10-19 C, mproton = 1.67 × 10-27 kg) 1.0 C 1000 C 9.6 × 10^7 C 6.0 × 10^26 C 6.0 × 10^23 C

9.6 × 10^7 C

Four point charges of equal magnitude but with varying signs are arranged on three of the corners and at the center of the square of side d as shown in the figure. Which one of the arrows shown represents the net force acting on the center charge? A B C D

A

Four point charges of equal magnitudes but with varying signs are arranged on three of the corners and at the center of the square of side d as shown in the figure. Which one of the arrows shown represents the net force acting on the center charge? A B C D

A

Three equal charges +Q are at three of the corners of a square of side d. A fourth charge +Q of equal magnitude is at the center of the square as shown in the figure Which one of the arrows shown represents the net force acting on the charge at the center of the square? A B C D

B

Two point charges, q1 and q2, are separated by a distance R. If the magnitudes of both charges are halved and their separation is also halved, what happens to the electrical force that each charge exerts on the other one? It increases by a factor of 16. It increases by a factor of 8. It increases by a factor of 2. It increases by a factor of 4. It remains the same.

It remains the same.

In outer space, a positive charge q is released near a positive fixed charge Q, as shown in the figure. As q moves away from Q, what is true about the motion of q? It will move with decreasing speed. It will move with constant acceleration. It will move with increasing acceleration. It will move with decreasing acceleration. It will move with increasing speed.

It will move with decreasing acceleration.

An electron and a proton are released simultaneously from rest and start moving toward each other due to their electrostatic attraction, with no other forces present. Which of the following statements are true just before they are about to collide? (There could be more than one correct choice.) They are closer to the to the initial position of the electron that to the initial position of the proton. They are closer to the initial position of the proton that to the initial position of the electron. They are at the midpoint of their initial separation. They both have the same speed. The electrostatic force on the proton is greater than the electrostatic force on the electron.

They are closer to the initial position of the proton that to the initial position of the electron.

A plastic rod is charged up by rubbing a wool cloth, and brought to an initially neutral metallic sphere that is insulated from ground. It is allowed to touch the sphere for a few seconds, and then is separated from the sphere by a small distance. After the rod is separated, the rod is repelled by the sphere. is attracted to the sphere. feels no force due to the sphere.

is repelled by the sphere

What charge does an Electron have? Positive Negative Neutral None of the above

negative

What charge does a Neutron have? Positive Negative Neutral None of the above

neutral

Three point charges are located on the x-axis at the following positions: Q1 = +2.00 μC is at x = 1.00 m, Q2 = +3.00 μC is at x = 0.00, and Q3 = -5.00 μC is at x = -1.00 m. What is the magnitude of the electric force on Q2? (k = 8.99 × 109 N • m2/C2) 0.0540 N 0.135 N 0.158 N 0.0810 N 0.189 N

0.189 N

What charge does a Poton have? Positive Negative Neutral None of the above

positive

A hydrogen nucleus, which has a charge +e, is situated to the left of a carbon nucleus, which has a charge +6e. Which statement is true? The electrical force experienced by the hydrogen nucleus is to the left, and the magnitude is equal to the force exerted on the carbon nucleus. The electrical force experienced by the hydrogen nucleus is to the left, and the magnitude is greater than the force exerted on the carbon nucleus. The electrical force experienced by the hydrogen nucleus is to the left, and the magnitude is less than the force exerted on the carbon nucleus. The electrical force experienced by the hydrogen nucleus is to the right, and the magnitude is equal to the force exerted on the carbon nucleus.

The electrical force experienced by the hydrogen nucleus is to the left, and the magnitude is equal to the force exerted on the carbon nucleus.

True or False: Like charges will attract. true false

false

Electrically neutral objects cannot exert an electrical force on each other, but they can exert a gravitational force on each other. True False

true

True or False: Opposite charges will attract. true false

true