Physics Test 2 Chapter 19

T OR F? A good conductor of electricity is a bad conductor of heat

False

T OR F? A neutron carries a negative charge?

False

T OR F? A neutron is approximately twice as heavy as the electron

False

T OR F? Electric charge is quantized

true

T OR F? the Coulomb force between two charges can be attractive or repulsive

true

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 Figure 19-2. Which of the arrows shown represents the net force acting on the center charge? A) A B) B C) C D) D E) none of the above

A

Four point charges of varying magnitude and sign are arranged on the corners of the square of side d as shown in Figure 19-6. Which of the arrows shown represents the net force acting on the point charge with a charge +Q? A) A B) B C) C D) D E) none of the above

A

Four equal charges are located at the corners of a square of side d. If the magnitude of each charge is doubled, then what happens to the resultant force on each charge? A) It is doubled. B) It is quadrupled. C) It increases by a factor of 8. D) It remains the same. E) None of the other choices is correct.

B

Three equal charges are at three of the corners of a square of side d. A fourth charge of equal magnitude is at the center of the square as shown in Figure 19-1. Which of the arrows shown represents the net force acting on the charge at the center of the square? A) A B) B C) C D) D E) none of the above

B

Two objects, A and B, are rubbed together. As a result, object A acquires an excess negative charge while object B becomes positively charged. In comparison to their masses before the charging process, you can say that A) the mass of both objects increased. B) the mass of A increased and that of B decreased. C) the mass of A decreased and that of B increased. D) the mass of both objects decreased. E) None of the other choices is correct.

B

When the magnitude of both interacting charges is increased by a factor of 2, the electrical forces between these charges is A) doubled. B) quadrupled. C) reduced by a factor of 3. D) reduced by a factor of . E) reduced by a factor of 4.

B

The main difference between conductors and insulators is in terms of A) protons. B) neutrons. C) valence or conduction electrons. D) atoms. E) None of the other choices is correct.

C

The number of protons in the nucleus of an electrically neutral atom is equal to A) the number of neutrons in the nucleus. B) the number of neutrons surrounding the nucleus. C) the number of electrons surrounding the nucleus. D) the number of electrons in the nucleus. E) None of the other choices is correct.

C

Four point charges of equal magnitude and sign are arranged on the corners of the square of side d as shown in Figure 19-5. Which of the arrows shown represents the net force acting on the charge at the upper right hand corner of the square? A) A B) B C) C D) D E) none of the above

D

Four point charges of equal magnitude and sign are arranged on three of the corners of the square of side d as shown in Figure 19-4. Which of the arrows shown represents the net force acting on the charge at the upper right hand corner of the square? A) A B) B C) C D) D E) none of the above

D

When atom A loses an electron to atom B, A) atom A becomes more negative than atom B. B) atom A acquires more neutrons than atom B. C) atom A acquires less neutrons than atom B. D) atom A becomes a positive ion and atom B becomes a negative ion. E) atom A becomes a negative ion and atom B becomes a positive ion.

D

When the distance between the two charges is doubled, the force between them is A) doubled. B) quadrupled. C) reduced by a factor of 3. D) reduced by factor of 4.

D

Electrical and gravitational forces follow similar equations with one main difference: A) Electrical forces obey the inverse square law and gravitational forces do not. B) Gravitational forces obey the inverse square law and electrical forces do not. C) Electrical forces attract and gravitational forces repel. D) Electrical forces repel and gravitational forces attract. E) Gravitational forces are always attractive but electrical forces can be attractive or repulsive.

E

The charge on the proton is the same as A) the charge on the neutron. B) the charge on the neutron, but of the opposite sign. C) the charge on the atom. D) the charge on the electron. E) the charge on the electron, but of the opposite sign.

E

Two charges, Q1 and Q2, are separated by a certain distance R. If the magnitudes of the charges are doubled and their separation is also doubled, then what happens to the electrical force between these two charges? A) It is doubled. B) It changes by a factor of 3. C) reduced by a factor of 2 . D) It is quadrupled. E) It remains the same.

E

Two charges, Q1 and Q2, are separated by a certain distance R. If the magnitudes of the charges are halved, and their separation is also halved, then what happens to the electrical force between these charges? A) It increases by a factor of 16. B) It increases by a factor of 8. C) It is doubled. D) It is quadrupled. E) It remains the same.

E

T OR F? an electrical neutral atom does not have a net charge?

True