PHYS 1260 Exam 1 Review Questions

Dewitt ECU 17-Electrical Field, 18-Electrical Potential, 19-Electric Current

Just as gravity is the study of a wide range of
gravitational interactions, electricity is the study of a
wide range of
A) electrical charges.
B) electrical forces.
C) electrical interactions.
D) \[none of these\]

C) Electrical Interactions

Electrostatics is a branch of electricity that focuses
on
A) electrical charge.
B) electrical force.
C) both of these when static.
D) \[none of these\]

C) 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) \[none of these\]

A) 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) \[neither of these\]

A) 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) \[neither of these\]

B) electrical.

The unit of electric charge, the coulomb, is the
charge on a
A) single electron.
B) specific large number of electrons.
C) neutron.
D) specific number of neutrons.
E) quark.

B) specific large number of electrons.

When the distance between two charges is halved,
the electrical force between them
A) is reduced by 1/4.
B) halves.
C) doubles.
D) quadruples.
E) \[none of these\]

D) quadruples.

The electrical force between electric charges
depends only on their
A) magnitude (strength of charge).
B) separation distance.
C) \[both of these\]
D) \[neither of these\]

C) \[both of these\]

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.
C) 60 N/C.
D) 120 N/C.
E) 240 N/C.

B) 30 N/C.

The electric field between oppositely-charged \n parallel plates is \n A) uniform. \n B) stronger at the ends. \n C) composed of field lines in opposite directions. \n D) \[none of these\]

A) uniform.

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) \[none of these\]

C) 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) \[none of these\]

B) 10 V

To think of electric potential difference we are
thinking about
A) current.
B) voltage.
C) resistance.

B) voltage.

To think of electric potential difference we are
thinking about
A) current.
B) voltage.
C) resistance.

A) 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) \[none of these\]

B) 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.

C) 6 joules.

The unit of electrical resistance is the
A) volt.
B) ampere.
C) ohm.
D) \[none of these\]

C) ohm.

The current produced by voltage in a circuit is
impeded by
A) electric barriers.
B) closed switches.
C) electric resistance.
D) \[none of these\]

C) electric resistance.

Ohm’s law tells us that the amount of current
produced in a circuit is
A) directly proportional to voltage.
B) inversely proportional to resistance.
C) \[both of these\]
D) \[neither of these\]

C) \[both of these\]

Current in a conductor can be increased by
A) increasing the voltage across it.
B) reducing its resistance.
C) \[both of these\]
D) \[neither of these\]

C) \[both of these\]