Phys 108- Final Exam: Test Questions
and Answers with Complete Solutions |
100% Correct | 2026
How much energy is stored by pushing 4 coulombs of charge into an electric field,
where its voltage is 2 V greater compared to its starting position? - ANSWERS
V=PE/C
PE=2x4
PE= 8 Joules
The electrical force between charges depends only on the charges'... -
ANSWERS Magnitude and separation distance
When there is a change in the magnetic field in a closed loop of wire... -
ANSWERS 1. a voltage is induced in the wire
2. electromagnetic induction occurs
3. a current is created in the loop of the wore
[all of the above]
When a single charge q is placed at one corner of a square, the electric field at the
center of the square is F/q. If two other equal charges are placed at the adjacent
corners of the square, the electric field at the center of the square due to these
three equal charges is... - ANSWERS F/q
Which statement is correct between:
,1. Voltage flows through an open or a closed circuit
2. Current is the primary cause of voltage
3. Resistance flows through an open circuit
4. Charge flows through a closed circuit - ANSWERS Charge flows through a
closed circuit
Like kinds of magnetic poles repel while unlike kinds of magnetic poles... -
ANSWERS attract
The primary source of electrons in an ordinary electrical circuit is... - ANSWERS
the electric current itself
An electroscope is charged positively as shown by foil leaves that stand apart. As a
negative charge is brought to the electroscope, the leaves... - ANSWERS fall
closer together
The difference between an electric generator and an electric motor is that... -
ANSWERS the inputs and outputs are reversed
Magnetic field lines about a current-carrying wire... - ANSWERS circle the wire
in closed loops
The voltage across the input terminals of a transformer is 110 V. The primary has
100 loops and the secondary has 50 loops. The voltage the transformer puts out
is... - ANSWERS 110/2= 55 V
, Stretch a cooper wire so that it is thinner and the resistance between its ends... -
ANSWERS increases
Magnetism is due to the motion of electrons as they... - ANSWERS Spin on
their axis and revolve around the nucleus
A battery produces _______ and a generator produces _________. - ANSWERS
direct current; alternating current
Receiving an electric shock is much more dangerous when your skin is wet
because... - ANSWERS wet skin reduces the body;s resistance to electric
current
Charge carries in a metal are electrons rather than protons because electrons
are... - ANSWERS loosely bound
A 0.5 C charge is placed in a location where the electric field is 5 N/C. How much
electric force is exerted on the charge? - ANSWERS C= F/electric field
5=F/0.5
F=2.5 N
A 10 ohm resistor has a 5 A current in it. What is the voltage across the resistor? -
ANSWERS V=RxI
V=10x5
V= 50 V
and Answers with Complete Solutions |
100% Correct | 2026
How much energy is stored by pushing 4 coulombs of charge into an electric field,
where its voltage is 2 V greater compared to its starting position? - ANSWERS
V=PE/C
PE=2x4
PE= 8 Joules
The electrical force between charges depends only on the charges'... -
ANSWERS Magnitude and separation distance
When there is a change in the magnetic field in a closed loop of wire... -
ANSWERS 1. a voltage is induced in the wire
2. electromagnetic induction occurs
3. a current is created in the loop of the wore
[all of the above]
When a single charge q is placed at one corner of a square, the electric field at the
center of the square is F/q. If two other equal charges are placed at the adjacent
corners of the square, the electric field at the center of the square due to these
three equal charges is... - ANSWERS F/q
Which statement is correct between:
,1. Voltage flows through an open or a closed circuit
2. Current is the primary cause of voltage
3. Resistance flows through an open circuit
4. Charge flows through a closed circuit - ANSWERS Charge flows through a
closed circuit
Like kinds of magnetic poles repel while unlike kinds of magnetic poles... -
ANSWERS attract
The primary source of electrons in an ordinary electrical circuit is... - ANSWERS
the electric current itself
An electroscope is charged positively as shown by foil leaves that stand apart. As a
negative charge is brought to the electroscope, the leaves... - ANSWERS fall
closer together
The difference between an electric generator and an electric motor is that... -
ANSWERS the inputs and outputs are reversed
Magnetic field lines about a current-carrying wire... - ANSWERS circle the wire
in closed loops
The voltage across the input terminals of a transformer is 110 V. The primary has
100 loops and the secondary has 50 loops. The voltage the transformer puts out
is... - ANSWERS 110/2= 55 V
, Stretch a cooper wire so that it is thinner and the resistance between its ends... -
ANSWERS increases
Magnetism is due to the motion of electrons as they... - ANSWERS Spin on
their axis and revolve around the nucleus
A battery produces _______ and a generator produces _________. - ANSWERS
direct current; alternating current
Receiving an electric shock is much more dangerous when your skin is wet
because... - ANSWERS wet skin reduces the body;s resistance to electric
current
Charge carries in a metal are electrons rather than protons because electrons
are... - ANSWERS loosely bound
A 0.5 C charge is placed in a location where the electric field is 5 N/C. How much
electric force is exerted on the charge? - ANSWERS C= F/electric field
5=F/0.5
F=2.5 N
A 10 ohm resistor has a 5 A current in it. What is the voltage across the resistor? -
ANSWERS V=RxI
V=10x5
V= 50 V
