Question 1

In a(n) ______________, electrons do not move freely.

Accepted Answer

insulator

Question 2

The electrical power dissipated by a resistance R is

Accepted Answer

A)  inversely proportional to I. 
B)  directly proportional to I2. 
C)  directly proportional to I. 
D)  none of these. 
A)  inversely proportional to I. 
B)  directly proportional to I2. 
C)  directly proportional to I. 
D)  none of these. B

Question 3

If the voltage across a resistor is tripled, the current will

Accepted Answer

A)  remain the same. 
B)  be cut to one-third. 
C)  be cut by one-third. 
D)  be tripled. 
E)  be multiplied by nine. 
A)  remain the same. 
B)  be cut to one-third. 
C)  be cut by one-third. 
D)  be tripled. 
E)  be multiplied by nine. D

Question 4

A system of a proton and an electron has a net charge of

Accepted Answer

A)  +1.6 × 10-19 C. 
B)  -1.6 × 10-19 C. 
C)  3.2 × 10-19 C. 
D)  zero. 
A)  +1.6 × 10-19 C. 
B)  -1.6 × 10-19 C. 
C)  3.2 × 10-19 C. 
D)  zero.

Question 5

A 10-Ω resistor and a 20-Ω resistor are connected in parallel, and this combination is connected in series to a 30-Ω resistor. If the arrangement is hooked to a 12-V battery, how much current flows in the circuit?

Accepted Answer

The answer of A 10-Ω resistor and a 20-Ω resistor...

Question 6

The expression that mathematically describes the force between two static electric charges is called ______________.

Accepted Answer

The answer of The expression that mathematically describes the force...

Question 7

If a negatively charged object is brought near a suspended, negatively charged object, the suspended object will be

Accepted Answer

A)  repelled. 
B)  charged more. 
C)  discharged. 
D)  attracted. 
A)  repelled. 
B)  charged more. 
C)  discharged. 
D)  attracted.

Question 8

A system of 8 electrons, 18 protons, and 4 neutrons has a net charge of

Accepted Answer

A)  16.0 × 10-19 C. 
B)  -16.0 × 10-19 C. 
C)  22.4 × 10-19 C. 
D)  10.0 × 10-19 C. 
E)  -22.4 × 10-19 C. 
A)  16.0 × 10-19 C. 
B)  -16.0 × 10-19 C. 
C)  22.4 × 10-19 C. 
D)  10.0 × 10-19 C. 
E)  -22.4 × 10-19 C.

Question 9

If the voltage across a resistor is doubled, the current will

Accepted Answer

A)  remain the same. 
B)  be cut to one-fourth. 
C)  be cut in half. 
D)  be doubled. 
E)  be quadrupled. 
A)  remain the same. 
B)  be cut to one-fourth. 
C)  be cut in half. 
D)  be doubled. 
E)  be quadrupled.

Question 10

Consider a wire in a magnetic field, as shown in the following figure, with a current flowing upward through it. What will happen to the wire?

Accepted Answer

A)  The wire will be forced toward the north pole. 
B)  The wire will be forced perpendicular to the plane of the magnetic field, into the page. 
C)  The wire will be forced perpendicular to the plane of the magnetic field, out of the page. 
D)  The current will cease flowing. 
E)  The wire will be forced toward the south pole. 
A)  The wire will be forced toward the north pole. 
B)  The wire will be forced perpendicular to the plane of the magnetic field, into the page. 
C)  The wire will be forced perpendicular to the plane of the magnetic field, out of the page. 
D)  The current will cease flowing. 
E)  The wire will be forced toward the south pole.

Question 11

The north pole of a compass points toward Earth's magnetic ______________ pole.

Accepted Answer

The answer of The north pole of a compass points...

Question 12

A transformer with 800 turns on the primary coil is used to decrease the voltage from 2000 V to 120 V for home use. How many turns should be in the secondary coil?

Accepted Answer

The answer of A transformer with 800 turns on the...

Question 13

A system of 12 electrons and 18 protons has a net charge of

Accepted Answer

A)  9.6 × 10-19 C. 
B)  -9.6 × 10-19 C. 
C)  17.6 × 10-19 C. 
D)  6.0 × 10-19 C. 
E)  -17.6 × 10-19 C. 
A)  9.6 × 10-19 C. 
B)  -9.6 × 10-19 C. 
C)  17.6 × 10-19 C. 
D)  6.0 × 10-19 C. 
E)  -17.6 × 10-19 C.

Question 14

For electrical safety,

Accepted Answer

A)  electrical shocks caused by 1 A of current are of no concern. 
B)  fuses or circuit breakers are wired in series in circuits. 
C)  fuses larger than the rated value can be placed in a circuit. 
D)  fuses and circuit breakers are wired in parallel in circuits. 
A)  electrical shocks caused by 1 A of current are of no concern. 
B)  fuses or circuit breakers are wired in series in circuits. 
C)  fuses larger than the rated value can be placed in a circuit. 
D)  fuses and circuit breakers are wired in parallel in circuits.

Question 15

To prevent a home electric circuit from overheating because of too much current, a(n) ______________ is used.

Accepted Answer

circuit br

Question 16

The maximum current would flow in a set of resistors connected in ______________.

Accepted Answer

The answer of The maximum current would flow in a...

Question 17

A system of 18 electrons and 11 neutrons has a net charge of

Accepted Answer

A)  -28.8 × 10-19 C. 
B)  28.8 × 10-19 C. 
C)  -11.2 × 10-19 C. 
D)  -18.0 × 10-19 C. 
E)  11.2 × 10-19 C. 
A)  -28.8 × 10-19 C. 
B)  28.8 × 10-19 C. 
C)  -11.2 × 10-19 C. 
D)  -18.0 × 10-19 C. 
E)  11.2 × 10-19 C.

Question 18

A step-down transformer has more windings on the ______________ coil.

Accepted Answer

The answer of A step-down transformer has more windings on...

Question 19

Two oppositely charged particles ______________ one another.

Accepted Answer

The answer of Two oppositely charged particles ______________ one another....

Question 20

In a conductor, what moves?

Accepted Answer

A)  Electrons 
B)  Neutrons 
C)  Quarks 
D)  Protons 
A)  Electrons 
B)  Neutrons 
C)  Quarks 
D)  Protons

Exam 8: Electricity and Magnetism

In a(n) ______________, electrons do not move freely.

The electrical power dissipated by a resistance R is

If the voltage across a resistor is tripled, the current will

A system of a proton and an electron has a net charge of

A 10-Ω resistor and a 20-Ω resistor are connected in parallel, and this combination is connected in series to a 30-Ω resistor. If the arrangement is hooked to a 12-V battery, how much current flows in the circuit?

The expression that mathematically describes the force between two static electric charges is called ______________.

If a negatively charged object is brought near a suspended, negatively charged object, the suspended object will be

A system of 8 electrons, 18 protons, and 4 neutrons has a net charge of

If the voltage across a resistor is doubled, the current will

Consider a wire in a magnetic field, as shown in the following figure, with a current flowing upward through it. What will happen to the wire?

The north pole of a compass points toward Earth's magnetic ______________ pole.

A transformer with 800 turns on the primary coil is used to decrease the voltage from 2000 V to 120 V for home use. How many turns should be in the secondary coil?

A system of 12 electrons and 18 protons has a net charge of

For electrical safety,

To prevent a home electric circuit from overheating because of too much current, a(n) ______________ is used.

The maximum current would flow in a set of resistors connected in ______________.

A system of 18 electrons and 11 neutrons has a net charge of

A step-down transformer has more windings on the ______________ coil.

Two oppositely charged particles ______________ one another.

In a conductor, what moves?

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