Deck 6: Coulombs Law

Question 1

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

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

Answer 1

add some electrons

Question 2

To make an uncharged object have a positive charge:

A) remove some neutrons
B) add some neutrons
C) add some electrons
D) remove some electrons
E) heat it to cause a change of phase

Answer 2

remove some electrons

Question 3

An electrical insulator is a material:

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

Answer 3

through which electrons do not flow easily

Question 4

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

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

Question 5

The leaves of a positively charged electroscope diverge more when an object is brought near the knob of the electroscope. The object must be:

A) a conductor
B) an insulator
C) positively charged
D) negatively charged
E) uncharged

Question 6

Consider the following procedural steps:
(1) ground the electroscope
(2) remove the ground from the electroscope
(3) touch a charged rod to the electroscope
(4) bring a charged rod near, but not touching, the electroscope
(5) remove the charged rod
To charge an electroscope by induction, use the sequence:

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

Question 7

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

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

Question 8

A small object has charge Q. Charge q is removed from it and placed on a second small object. The two objects are placed 1 m apart. For the force that each object exerts on the other to be a maximum. q should be:

A) 2Q
B) Q
C) Q/2
D) Q/4
E) 0