Answers3262 CR Physics B 2526Unit Test

Unit Test — Unit test Answers

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1
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How does a rubber rod become negatively charged through friction?

A
It touches a negatively charged object, and protons move off of the rod.
B
It touches a positively charged object, and electrons move onto the rod.
C
It is rubbed with another object, and electrons move onto the rod.
D
It is rubbed with another object, and protons move off of the rod.
2
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Suchita sees this symbol shown in a circuit diagram.

Question illustration
A
to measure current
B
to measure voltage
C
to provide electrical energy
D
to use electrical energy
3

An electric field around two charged objects is shown.

Question illustration
A
X: negativeY: positive
B
X: positiveY: positive
C
X: negativeY: negative
D
X: positiveY: negative
4

In a movie, the heroine saves the day by cutting a wire before the time runs out on a timer.

A
She changed a short circuit to an open circuit.
B
She changed an open circuit to a closed circuit.
C
She changed a closed circuit to an open circuit.
D
She changed a closed circuit to a short circuit.
5

The area around a charged object that can exert a force on other charged objects is a(n) _________.

A
electric field
B
field line
C
conductor
D
electric potential energy
6

A circuit has a resistance of 2.5 Ω and is powered by a 12.0 V battery. The current in the circuit, to the nearest tenth, is A.

Answer not available
7

How does the electrical force relate to the distance between two charged objects?

A
It is inversely proportional to the square of the distance.
B
It is directly proportional to the square of the distance.
C
It is inversely proportional to the distance.
D
It is directly proportional to the distance.
8

What formula gives the strength of an electric field, E, at a distance from a known source charge?

A
E =
Option A
B
E =
Option B
C
E =
Option C
D
E =
Option D
9

The diagram shows the electric field in the vicinity of a charge.

Question illustration
A
W
B
X
C
Y
D
Z
10

Which equation relates charge, time, and current?

A
I equals delta q over t
Option A
B
I equals t over delta q.
Option B
C
Option
Option C
D
Option
Option D
11

Which statements are correct? Check all that apply.

A
Charge Q is positive.
B
Charge Q is negative.
C
The electric field is uniform.
D
The electric field is nonuniform.
E
If charge A is negative, it moves away from charge Q.
F
If charge A is positive, it moves away from charge Q.
12

After hearing about an accident on his normal route, Mr. Gujral checks for alternate routes to get to work.

A
a series circuit because there is more than one path
B
a series circuit because there is only one path
C
a parallel circuit because there is more than one path
D
a parallel circuit because there is only one path
13

A circuit carries a current of 0.64 A when there is a resistance of 50.0 Ω. The voltage applied to the circuit, to the nearest whole number, is V.

Answer not available
14

A source charge generates an electric field of 1236 N/C at a distance of 4 m. What is the magnitude of the source charge? (Use k=)

Question illustration
A
2.2 µC
B
680 µC
C
2.2 C
D
680 C
15

Kiki makes a table to compare the particles in a magnesium atom to those in a magnesium ion.She knows that a magnesium ion has an electric field that points away from the ion. What values should she use to complete her table?

Question illustration
A
X: 14Y: 12Z: 12
B
X: 12Y: 12Z: 10
C
X: 12Y: 10Z: 12
D
X: 12Y: 12Z: 14
16

The strength of the electric field 0.5 m from a 6 µC charge is _______ N/C. (Use k = 8.99 × 109 N• and round answer to the nearest whole number.)

Question illustration
A
215760
B
539400
C
697976
D
512356
17

Which changes would cause an increase in the resistance of a wire? Check all that apply.increasing its temperaturedecreasing its temperatureusing a longer wireusing a shorter wireusing a thicker wireusing a thinner wire

A
increasing its temperature
B
decreasing its temperature
C
using a longer wire
D
using a shorter wire
E
using a thicker wire
F
using a thinner wire
18

A pair of opposite electric charges of equal magnitude is called a(n)

A
dipole.
B
point charge.
C
electric field.
D
field line.
19

A circuit has a current of 3.6 A and a resistance of 5.0 Ω.What is the voltage applied to the circuit?

A
0.72 V
B
1.4 V
C
8.6 V
D
18 V
20

A wire delivers 12.0 C of charge in 4.0 s.What is the current in the wire?

A
3.0 A
B
8.0 A
C
16 A
D
48 A

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