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PHYS 1260 EXAM 1-4 QUESTIONS AND ANSWERS SPRING 2025 GRADED A+ PHYS 1260 EXAM 1-4 Electric potential, measured in volts, is the ratio of electrical potential energy to the amount of electric A) current. B) resistance. C) charge. D) voltage. E) [none of these] Charge If 10 J of work is used in pushing a 1-C charge into an electric field, its electric potential relative to its starting position is A) less than 10 V. B) 10 V. C) more than 10 V. D) [none of these] 10 V An electron is pushed into an electric field where it acquires a 1-V electric potential. If two electrons are pushed the same distance into the same electric field, the electric potential of each electron is A) 0.25 V. B) 0.5 V. C) 1 V. D) 2 V. E) 4 V. 1 V
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Electric potential, measured in volts, is the ratio of electrical potential energy to the amount of electric
A) current.
B) resistance.
C) charge.
D) voltage.
E) [none of these]
Charge
If 10 J of work is used in pushing a 1-C charge into an electric field, its electric potential relative to its starting position is
A) less than 10 V.
B) 10 V.
C) more than 10 V.
D) [none of these]
10 V
An electron is pushed into an electric field where it acquires a 1-V electric potential. If two electrons are pushed the same distance into the same electric field, the electric potential of each electron is
A) 0.25 V.
B) 0.5 V.
C) 1 V.
D) 2 V.
E) 4 V.
1 V
The net charge on a parallel-plate capacitor depends on
A) the area of the capacitor plates.
B) the distance between the capacitor plates.
C) the medium between the capacitor plates.
D) [all of these]
E) [none of these]
all of these
The electrical force between charges is strongest when the charges are
A) close together
.B) far apart.
C) [either of these]
D) [need more information]
close together
The electrical force between electric charges depends only on their
A) magnitude (strength of charge).
B) separation distance.
C) [both of these]
D) [neither of these]
both of these
The electrical force on a 2-C charge is 60 N. The electric field where the charge is located is
A) 20 N/C.
B) 30 N/C.
The direction of the electric field is the same as the direction of the electric (Coulomb) force exerted on
A) a neutral test charge.
B) an electron.
C) an atom.
D) a proton.
E) a molecule.
a proton
Between a pair of equal and opposite charges, field lines are
A) directed from positive to negative.
B) more concentrated closer to the charges.
C) vectors, with patterns that stem from the inverse-square law.
D) [all of these]
Just as gravity is the study of a wide range of gravitational interactions, electricity is the study of a wide range ofA) electrical charges.
B) electrical forces.
C) electrical interactions.
D) [none of these]
electrical interactions
Electrostatics is a branch of electricity that focuses on
A) electrical charge.
B) electrical force.
C) both of these when static.
D) [none of these]
both of these when static
In an electrically neutral atom the number of protons in the nucleus is equal to the number of
A) electrons that surround the nucleus.
B) neutrons in the nucleus.
C) both electrons and neutrons.
D) [none of these]
electrons that surround the nucleus
The pair of protons in the nucleus of a helium atom
A) attract a pair of orbiting electrons.
B) repel orbiting electrons.
C) [both of these]
D) [neither of these]
attract a pair of orbiting electrons
Two protons attract each other gravitationally and repel each other electrically. The stronger of these two forces is
A) gravitation.
B) electrical.
C) [neither of these]
electrical
The unit of electric charge, the coulomb, is the charge on a
C) composed of field lines in opposite directions.
D) [none of these]
uniform
To think of electric potential difference we are thinking about
A) current.
B) voltage.
C) resistance.
voltage
An ampere is a unit of electric
A) current.
B) voltage.
C) resistance.
current
Electrons flow in a wire when there is
A) an imbalance of charges in the wire.
B) a potential difference across its ends.
C) a difference in potential energy across its ends.
D) [none of these]
a potential difference across its ends
A coulomb of charge flowing in a bulb filament powered by a 6-volt battery is provided with
A) 6 ohms.
B) 6 amperes.
C) 6 joules.
D) 6 watts.
E) 6 newtons.
6 joules
The unit of electrical resistance is the
A) volt.
B) ampere.
C) ohm.
When two lamps are connected in series to a battery, the electrical resistance that the battery "senses" is
More than the resistance of either lamp
When two lamps are connected in parallel to a battery, the electrical resistance that the battery "senses" is
Less than the resistance of either lamp
When two identical lamps in a circuit are connected in parallel, the total resistance is
less than the resistance of either lamp.
Consider a lamp powered by a battery. Charge flows
through both the battery and the lamp
The direction of the force exerted on a moving charge in a magnetic field is
at right angles to the direction of the motion
The force on an electron moving in a magnetic field will be least when its direction is
the same as the magnetic field direction
A beam of singly-charged ions entering a magnetic field are swept into circular paths. The wider paths are those of
the heavier ions
When current reverses direction in a wire, the surrounding magnetic field
also reverses direction
A weak and strong magnet repel each other. The greater repelling force is by the
both the same
The magnetic force on a moving charged particle can change the particles's
Direction
A motor and a generator are
similar devices
The amount of current produced by electromagnetic induction depends on the
Both A and B
A. Amount of induced voltage
B. Resistance of the circuit to which it is connected.
When a magnet is moved to and fro in a wire coil, voltage is induced. If the coil has twice as many loops, the voltage induced is
twice
When a change occurs in the magnetic field in a closed loop of wire
All of these
A. A voltage is induced in the wire
B. A current is created in the loop of wire
C. Electromagnetic induction occurs
Electromagnetic induction occurs in a coil when there is a change in
Magnetic field intensity in the coil
At rate at which energy is transferred is
power
The resistance you feel when pushing a piece of iron into a coil involves
repulsion by the magnetic field you produce.
More voltage is induced when a magnet is thrust into a coil
Magnet A has twice the magnetic field strength of Magnet B and at a certain distance pulls on magnet B with a force of 100 N. The amount of force that magnet A exerts on magnet B is
Exactly 100 N
Compared to the huge force that attracts an iron tack to a strong magnet, the force that the tack exerts on the magnet is
equally huge
Like kinds of magnetic poles repel while unlike kinds of magnetic poles
attract
Whereas electric charges can be isolated, magnetic poles
cannot
The frequency of induced voltage in a wire coil depends on
How frequency a magnet dips in and out of the coil
Surrounding every stationary electron is
An electric field
Surrounding every moving electron is
A magnetic field and an electric field
The shape of a magnetic field surrounding a current-carrying conductor is
Circular
Magnetic field lines about a current-carrying wire
circle the wire in closed loops
The direction of the force exerted on a moving charge in a magnetic field is
At right angles to the direction of the motion
