Question 1

When a hard rubber rod is given a negative charge by rubbing it with wool:

Accepted Answer

A) positive charges are transferred from rod to wool 
B) negative charges are transferred from rod to wool 
C) positive charges are transferred from wool to rod 
D) negative charges are transferred from wool to rod 
E) negative charges are created and stored on the rod 
A) positive charges are transferred from rod to wool 
B) negative charges are transferred from rod to wool 
C) positive charges are transferred from wool to rod 
D) negative charges are transferred from wool to rod 
E) negative charges are created and stored on the rod D

Question 2

A conductor is distinguished from an insulator with the same number of atoms by the number of:

Accepted Answer

A) nearly free atoms 
B) electrons 
C) nearly free electrons 
D) protons 
E) molecules 
A) nearly free atoms 
B) electrons 
C) nearly free electrons 
D) protons 
E) molecules C

Question 3

Two small charged objects repel each other with a force F when separated by a distance d.If the charge on each object is reduced to one-fourth of its original value and the distance between them is reduced to d/2 the force becomes:

Accepted Answer

A) F/16 
B) F/8 
C) F/4 
D) F/2 
E) F 
A) F/16 
B) F/8 
C) F/4 
D) F/2 
E) F C

Question 4

A positively charged insulating rod is brought close to an object that is suspended by a string.If the object is attracted toward the rod we can conclude:

Accepted Answer

A) the object is positively charged 
B) the object is negatively charged 
C) the object is an insulator 
D) the object is a conductor 
E) none of the above 
A) the object is positively charged 
B) the object is negatively charged 
C) the object is an insulator 
D) the object is a conductor 
E) none of the above

Question 5

A nucleus of carbon 14 has 6 protons and 8 neutrons.The atomic number and mass number of carbon 14 are, respectively,

Accepted Answer

A) 6 and 8 
B) 6 and 14 
C) 8 and 14 
D) 14 and 20 
E) 14 and 22 
A) 6 and 8 
B) 6 and 14 
C) 8 and 14 
D) 14 and 20 
E) 14 and 22

Question 6

A wire contains a steady current of 2 A.The charge that passes a cross section in 2 s is:

Accepted Answer

A) 3.2 * 10-19 C 
B) 6.4 *10-19 C 
C) 1 C 
D) 2 C 
E) 4 C 
A) 3.2 * 10-19 C 
B) 6.4 *10-19 C 
C) 1 C 
D) 2 C 
E) 4 C

Question 7

Which of the following is NOT a possible value for the electric charge on an object?

Accepted Answer

A) 8 x 10-20 C 
B) 8 x 10-19 C 
C) 8 x 10-18 C 
D) 8 x 10-17 C 
E) 8 x 10-16 C 
A) 8 x 10-20 C 
B) 8 x 10-19 C 
C) 8 x 10-18 C 
D) 8 x 10-17 C 
E) 8 x 10-16 C

Question 8

Two identical conducting spheres A and B carry equal charge and exert electrostatic forces of magnitude F on each other.They are separated by a distance much larger than their diameters.A third identical conducting sphere C is uncharged.Sphere C is first touched to A, then to B, and finally removed.As a result, the electrostatic force between A and B becomes:

Accepted Answer

A) F/2 
B) F/4 
C) 3F/8 
D) F/16 
E) 0 
A) F/2 
B) F/4 
C) 3F/8 
D) F/16 
E) 0

Question 9

A charged insulator can be discharged by passing it just above a flame.This is because the flame:

Accepted Answer

A) warms it 
B) dries it 
C) contains carbon dioxide 
D) contains ions 
E) contains more rapidly moving atoms 
A) warms it 
B) dries it 
C) contains carbon dioxide 
D) contains ions 
E) contains more rapidly moving atoms

Question 10

The magnitude of the total negative charge on the electrons in 1 mol of helium (atomic number 2, atomic mass 4)is:

Accepted Answer

A) 4.8 * 104 C 
B) 9.6 * 104 C 
C) 1.9 * 105 C 
D) 3.8 * 105 C 
E) 7.7 * 105 C 
A) 4.8 * 104 C 
B) 9.6 * 104 C 
C) 1.9 * 105 C 
D) 3.8 * 105 C 
E) 7.7 * 105 C

Question 11

Charge is distributed uniformly on the surface of a spherical balloon (an insulator).A point particle with charge q is inside.The electrical force on the particle q is greatest when:

Accepted Answer

A) it is just outside the surface of the balloon 
B) it is at the center of the balloon 
C) it is halfway between the balloon center and the inside surface 
D) it is anywhere inside (the force is same everywhere and is not zero) 
E) it is anywhere inside (the force is zero everywhere) 
A) it is just outside the surface of the balloon 
B) it is at the center of the balloon 
C) it is halfway between the balloon center and the inside surface 
D) it is anywhere inside (the force is same everywhere and is not zero) 
E) it is anywhere inside (the force is zero everywhere)

Question 12

An electrical insulator is a material:

Accepted Answer

A) containing no electrons 
B) through which electrons do not flow easily 
C) which has more electrons than protons on its surface 
D) cannot be a pure chemical element 
E) must be a crystal 
A) containing no electrons 
B) through which electrons do not flow easily 
C) which has more electrons than protons on its surface 
D) cannot be a pure chemical element 
E) must be a crystal

Question 13

The magnitude of the charge on an electron is approximately:

Accepted Answer

A) 1023 C 
B) 10-23 C 
C) 1019 C 
D) 10-19 C 
E) 109 C 
A) 1023 C 
B) 10-23 C 
C) 1019 C 
D) 10-19 C 
E) 109 C

Question 14

To make an uncharged object have a negative charge we must:

Accepted Answer

A) add some atoms 
B) remove some atoms 
C) add some electrons 
D) remove some electrons 
E) write down a negative sign 
A) add some atoms 
B) remove some atoms 
C) add some electrons 
D) remove some electrons 
E) write down a negative sign

Question 15

Is it ever possible for the following process to occur? γ → e+ + e- + e+

Accepted Answer

A) Yes, it is. 
B) No, this process does not conserve energy. 
C) No, this process does not conserve momentum. 
D) No, this process does not conserve mass. 
E) No, this process does not conserve electric charge. 
A) Yes, it is. 
B) No, this process does not conserve energy. 
C) No, this process does not conserve momentum. 
D) No, this process does not conserve mass. 
E) No, this process does not conserve electric charge.

Question 16

A wire contains a steady current of 2 A.The number of electrons that pass a cross section in 2 s is:

Accepted Answer

A) 2 
B) 4 
C) 6.3 * 1018 
D) 1.3 * 1019 
E) 2.5 * 1019 
A) 2 
B) 4 
C) 6.3 * 1018 
D) 1.3 * 1019 
E) 2.5 * 1019

Question 17

Consider the following procedural steps:   To charge an electroscope by induction, use the sequence:

Accepted Answer

A) 1, 4, 5, 2 
B) 4, 1, 2, 5 
C) 3, 1, 2, 5 
D) 4, 1, 5, 2 
E) 3, 5 
A) 1, 4, 5, 2 
B) 4, 1, 2, 5 
C) 3, 1, 2, 5 
D) 4, 1, 5, 2 
E) 3, 5

Question 18

Two particles, X and Y, are 4 m apart.X has a charge of 2Q and Y has a charge of Q.The force of X on Y:

Accepted Answer

A) has twice the magnitude of the force of Y on X 
B) has half the magnitude of the force of Y on X 
C) has four times the magnitude of the force of Y on X 
D) has one-fourth the magnitude of the force of Y on X 
E) has the same magnitude as the force of Y on X 
A) has twice the magnitude of the force of Y on X 
B) has half the magnitude of the force of Y on X 
C) has four times the magnitude of the force of Y on X 
D) has one-fourth the magnitude of the force of Y on X 
E) has the same magnitude as the force of Y on X

Question 19

If excess charge is put on a spherical nonconductor,

Accepted Answer

A) it remains where it was placed 
B) it spreads a little from where it was placed but not over the whole sphere 
C) it spreads uniformly over the surface of the sphere if the sphere is small 
D) it spreads uniformly throughout the volume of the conductor 
E) it spreads uniformly over the surface of the sphere 
A) it remains where it was placed 
B) it spreads a little from where it was placed but not over the whole sphere 
C) it spreads uniformly over the surface of the sphere if the sphere is small 
D) it spreads uniformly throughout the volume of the conductor 
E) it spreads uniformly over the surface of the sphere

Question 20

If excess charge is put on a spherical conductor,

Accepted Answer

A) it remains where it was placed 
B) it spreads a little from where it was placed but not over the whole sphere 
C) it spreads uniformly over the surface of the sphere if the sphere is small 
D) it spreads uniformly throughout the volume of the conductor 
E) it spreads uniformly over the surface of the sphere 
A) it remains where it was placed 
B) it spreads a little from where it was placed but not over the whole sphere 
C) it spreads uniformly over the surface of the sphere if the sphere is small 
D) it spreads uniformly throughout the volume of the conductor 
E) it spreads uniformly over the surface of the sphere

Exam 21: Electric Charge

When a hard rubber rod is given a negative charge by rubbing it with wool:

A conductor is distinguished from an insulator with the same number of atoms by the number of:

Two small charged objects repel each other with a force F when separated by a distance d.If the charge on each object is reduced to one-fourth of its original value and the distance between them is reduced to d/2 the force becomes:

A positively charged insulating rod is brought close to an object that is suspended by a string.If the object is attracted toward the rod we can conclude:

A nucleus of carbon 14 has 6 protons and 8 neutrons.The atomic number and mass number of carbon 14 are, respectively,

A wire contains a steady current of 2 A.The charge that passes a cross section in 2 s is:

Which of the following is NOT a possible value for the electric charge on an object?

A charged insulator can be discharged by passing it just above a flame.This is because the flame:

The magnitude of the total negative charge on the electrons in 1 mol of helium (atomic number 2, atomic mass 4)is:

Charge is distributed uniformly on the surface of a spherical balloon (an insulator).A point particle with charge q is inside.The electrical force on the particle q is greatest when:

An electrical insulator is a material:

The magnitude of the charge on an electron is approximately:

To make an uncharged object have a negative charge we must:

Is it ever possible for the following process to occur? γ → e+ + e- + e+

A wire contains a steady current of 2 A.The number of electrons that pass a cross section in 2 s is:

Consider the following procedural steps: To charge an electroscope by induction, use the sequence:

Two particles, X and Y, are 4 m apart.X has a charge of 2Q and Y has a charge of Q.The force of X on Y:

If excess charge is put on a spherical nonconductor,

If excess charge is put on a spherical conductor,

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Is it ever possible for the following process to occur? γ → e⁺+ e^- + e⁺