PHYSICS 112 FINAL EXAM QUESTIONS AND VERIFIED
ANSWERS
Electrically neutral objects cannot exert an electrical force on each other. - Answers -
True
A hydrogen nucleus, which has a charge +e, is situated to the left of a carbon nucleus,
which has a charge +6e. is it true that the electrical force experienced by the hydrogen
nucleus is to the left, and the magnitude is equal to the force exerted on the carbon
nucleus. - Answers - True
The fundamental charge (e) is the magnitude of the charge of an electron or proton:
e=1.6x10^-19 - Answers - True
This dipole in a uniform electric field will not move. - Answers - False
The Electric Field inside of a charged parallel plate capacitor is not uniform. - Answers -
False
The electron volt eV is a unit of power - Answers - False
Two proton are released from rest, with only the electrostatic force acting, their
acceleration will keep increasing. - Answers - False
Doubling the capacitance of a capacitor that is holding a constant charge causes the
energy stored in that capacitor to double. - Answers - False
A dielectric material such as paper is inserted between the plates of a capacitor as the
capacitor holds a fixed charge on its plates. the electric field between the plates as the
dielectric material is inserted will become weaker. - Answers - True
When a current flows through a metal wire, the moving charges are electrons. -
Answers - True
The length of a certain wire is kept the same while its radius is doubled. the resistance
of this wire does not change. - Answers - False
If the resistance in a constant voltage circuit is doubled, the power dissipated by that
circuit will increase by a factor of 2. - Answers - False
The resistivity of a material increases as the temperature goes up. - Answers - True
, A capacitor stores separated charges and has a potential difference, but has no emf. -
Answers - True
For different resistors in parallel the current through each resistor is not the same. -
Answers - True
The amount of current in a circuit depends jointly on the battery's emf and the
resistance of the circuit attached to the battery. - Answers - True
For capacitors in series, the voltage across each capacitor is the same. - Answers -
False
As more resistors are added in parallel across a constant voltage source, the power
supplied by the source increases. - Answers - True
The direction of the force on a current-carrying wire in a magnetic field is perpendicular
to both the current and the magnetic field. - Answers - True
Two long parallel wires placed side-by-side in a horizontal table carry identical currents
straight toward you. From your point of view, the magnetic field at a point exactly
between the two wires points upward. - Answers - False
We observe that a moving charged particle experiences no magnetic force. From this,
we can definitely conclude that no magnetic field exists in that region of space. -
Answers - False
Two long parallel wires are placed side-by-side on a horizontal table. If the wires carry a
current in the opposite direction, the wires will be attracted toward each other. -
Answers - False
X and Y are two initially uncharged metal spheres on insulating stands, and they are in
contact
with each other. A positively charged rod R is brought close to X as shown in part (a) of
the
figure. Sphere Y is now moved away from X, as shown in part (b). What are the final
charge
states of X and Y? - Answers - D) X is negative and Y is positive
Four point charges of equal magnitude but with varying signs are arranged on three of
the corners and at the center of the square of sided as shown in the figure. Which one
of the arrows shown represents the net force acting on the center charge? - Answers -
A) A
Two electrons are 20mm apart at closest approach. What is the magnitude of the
maximum electric force that they exert on each other - Answers - A) 5.8 × 10^-25 N
ANSWERS
Electrically neutral objects cannot exert an electrical force on each other. - Answers -
True
A hydrogen nucleus, which has a charge +e, is situated to the left of a carbon nucleus,
which has a charge +6e. is it true that the electrical force experienced by the hydrogen
nucleus is to the left, and the magnitude is equal to the force exerted on the carbon
nucleus. - Answers - True
The fundamental charge (e) is the magnitude of the charge of an electron or proton:
e=1.6x10^-19 - Answers - True
This dipole in a uniform electric field will not move. - Answers - False
The Electric Field inside of a charged parallel plate capacitor is not uniform. - Answers -
False
The electron volt eV is a unit of power - Answers - False
Two proton are released from rest, with only the electrostatic force acting, their
acceleration will keep increasing. - Answers - False
Doubling the capacitance of a capacitor that is holding a constant charge causes the
energy stored in that capacitor to double. - Answers - False
A dielectric material such as paper is inserted between the plates of a capacitor as the
capacitor holds a fixed charge on its plates. the electric field between the plates as the
dielectric material is inserted will become weaker. - Answers - True
When a current flows through a metal wire, the moving charges are electrons. -
Answers - True
The length of a certain wire is kept the same while its radius is doubled. the resistance
of this wire does not change. - Answers - False
If the resistance in a constant voltage circuit is doubled, the power dissipated by that
circuit will increase by a factor of 2. - Answers - False
The resistivity of a material increases as the temperature goes up. - Answers - True
, A capacitor stores separated charges and has a potential difference, but has no emf. -
Answers - True
For different resistors in parallel the current through each resistor is not the same. -
Answers - True
The amount of current in a circuit depends jointly on the battery's emf and the
resistance of the circuit attached to the battery. - Answers - True
For capacitors in series, the voltage across each capacitor is the same. - Answers -
False
As more resistors are added in parallel across a constant voltage source, the power
supplied by the source increases. - Answers - True
The direction of the force on a current-carrying wire in a magnetic field is perpendicular
to both the current and the magnetic field. - Answers - True
Two long parallel wires placed side-by-side in a horizontal table carry identical currents
straight toward you. From your point of view, the magnetic field at a point exactly
between the two wires points upward. - Answers - False
We observe that a moving charged particle experiences no magnetic force. From this,
we can definitely conclude that no magnetic field exists in that region of space. -
Answers - False
Two long parallel wires are placed side-by-side on a horizontal table. If the wires carry a
current in the opposite direction, the wires will be attracted toward each other. -
Answers - False
X and Y are two initially uncharged metal spheres on insulating stands, and they are in
contact
with each other. A positively charged rod R is brought close to X as shown in part (a) of
the
figure. Sphere Y is now moved away from X, as shown in part (b). What are the final
charge
states of X and Y? - Answers - D) X is negative and Y is positive
Four point charges of equal magnitude but with varying signs are arranged on three of
the corners and at the center of the square of sided as shown in the figure. Which one
of the arrows shown represents the net force acting on the center charge? - Answers -
A) A
Two electrons are 20mm apart at closest approach. What is the magnitude of the
maximum electric force that they exert on each other - Answers - A) 5.8 × 10^-25 N
