PHYS Ch. 10

If an atom starts with a charge of 11 protons, 12 neutrons, and 11 electrons and loses 2 electrons, what is its charge?

+2

An atom with 15 protons and 15 electrons gains 1 electrons to become an ion. What is its charge?

-1

Two equal charges repel one another with a force of 4.0 x 10-4 N when they are 10 cm apart. If they are moved until the separation is 20 cm, the repulsive force will be

1.0 x 10-4N.

When the charges remain the same but the distance is doubled the electrostatic force between the two spheres changes by a factor of

1/4

Two small, charged spheres are located a given distance apart. When the charge on one of the spheres is doubled the electrostatic force between the two spheres changes by a factor of

2

If a charge of +3 micro coulombs experiences a force of 6 mN in a direction of 300, what is the electric field at the location of the charge?

2 kN/at 30 degrees

What energy will an electron gain when accelerated through an electric potential of 5 volts?

8.0 x 10-19 J

Who named the charges positive and negative.

Ben Franklin

____ showed that lightning was a form of electricity.

Ben Franklin

F= kqq/r 2 is _______'s Law.

Coulomb

A glass rod is rubbed with nylon. The rod is then brought close to the metal knob of an electroscope. A person's finger briefly touches the knob on the far side and is then removed. After the rod is removed the charge on the electroscope will be ___________

Negative

A rubber rod is rubber against hair. The rod is then touched to the metal knob of an electroscope. The sign of the charge on the electroscope after contact is ___________________.

Negative

A small bit of paper is electrically neutral. A charged rod can attract the bit of paper by the process of __________________.

Polarization

When you receive a charge by TOUCHING a positively charged glass rod, what is the sign on the charge you acquire? Explain.

The charge will be positive because some of your electrons will flow onto the rod.

An electron situated near another electron would feel

a repulsive electrical force.

Which of the following would you not expect to be good electrical insulators?

aluminium

The field lines always point ___.

away from the positive

Two equal positive charges are near each other. If we increase the amount of charge on just one of them, then

both charges feel an increased electrical force.

An object that carries electricity well is said to be a ___________.

conductor

The unit for the electric charge is the ____________.

coulomb

When one measures the electric potential closer and closer to a negative charge, does the potential increase, decrease or remain the same?

decrease

A positive charge is fixed at the origin. A positive charge is moved along the x-axis from x = 10 cm to x = 50 cm. The potential energy of the system

decreases.

The electrical force between any two charged objects is

dependent on the sign of the charge on each object.

A uniform electric field has a magnitude of 10 N/C and is directed downward. A +0.5 charge is brought into the field. The charge will experience a force in the ______________ direction.

downward

The negative charge is carried by the _____.

electron

A(n) __________ force is caused by an unbalanced charge.

electrostatic

Compared to the magnitude of the charge on a proton, the magnitude of the electrical charge carried by an electron is

exactly the same.

If the distance between two charged objects is halved, what is the change in electrostatic force?

four times larger

A positive test charge is moved closer to another positive charge. The potential of the test charge _____________________ .

increases

If the distance between two spherical charged objects decreases by a factor of two, then the electrical force between the objects

increases by a factor of four.

That process of charging in which the object to be charged is momentarily grounded rather than being touched by the charging device is called charging by

induction

The static electricity force is _____ the square of the distance between two charged objects.

inversely proportional to

An atom has

just as many electrons as protons.

If the distance between two charged objects is tripled, what is the change in electrostatic force? Question 14 options:

one ninth as large

The excess charge on an object usually resides on the ____ of the object.

outside

The electric field created by a negative charge

points toward the charge

A charged balloon can stick to a neutral wall because the wall is____

polarized

A glass rod is rubbed with silk so that the silk becomes negative. The rod is then used to charge an electroscope. The charge on the electroscope will be

positive if charged by contact.

That like charges (--------------) each other is part of the basic law of electrostatics.

repel

A strip of fur is rubbed against a hard rubber rod. The rod thereby acquires a negative charge because

rubbing caused electrons to move from the fur to the rod.

When you rub a rubber balloon on your hair

the hair gives electrons to the rubber balloon, giving the balloon a negative charge.

After a glass rod is rubbed with a nylon cloth

the rod will have a positive charge and the cloth negative.

If you double the number of negative charges on a balloon, what happens to the force of attraction of the balloon to a positive rod?

twice as large

A positively charged rod is brought close to an uncharged electroscope. While the rod is close, one's finger touches the far side of the metal ball on the electroscope. The rod is removed and then the finger is taken away. The electroscope is

uncharged.

It is observed that a positive charge released between the parallel plates of a capacitor moves upward. The direction of the electric field between the capacitor plates is__________________.

upward