1|Page
PHYS 2326 Exam 2026-2027 BANK QUESTIONS WITH
DETAILED VERIFIED ANSWERS EXAM QUESTIONS WILL
COME FROM HERE (100% CORRECT ANSWERS A+ GRADED
1. What is the work done by the electric field when a positive test
charge moves along an equipotential line?
A) Positive
B) Negative
C) Zero
D) Depends on the magnitude of the charge
Answer: C
Explanation: The potential difference between any two points on an
equipotential line is zero. Work is defined as the negative change in
potential energy, W = -qΔV. Since ΔV = 0, the work done is zero.
2. Two point charges are separated by a distance d. If the distance is
doubled, what happens to the electric potential energy of the system?
A) It doubles
B) It is halved
C) It quadruples
D) It remains the same
Answer: B
,2|Page
Explanation: The electric potential energy U is proportional to 1/r (U =
kq1q2/r). If r is doubled, U becomes half of its original value.
3. What is the net electric potential at the exact center of an electric
dipole?
A) Zero
B) Infinite
C) Non-zero positive
D) Non-zero negative
Answer: A
Explanation: The electric potential is a scalar quantity given by V = kq/r.
At the center of a dipole, the distances from the positive and negative
charges are equal. Thus, the potentials sum to zero (kq/r + k(-q)/r = 0).
4. A metallic sphere of radius R contains a total charge Q. What is the
electric potential at the surface (with V=0 at infinity)?
A) kQ/R^2
B) kQ/R
C) kQ/(2R)
D) Zero
Answer: B
Explanation: Outside a spherically symmetric charge distribution, the
potential is identical to that of a point charge located at the center.
Therefore, at the surface (distance R), V = kQ/R.
,3|Page
5. Which unit is equivalent to one electron volt (eV)?
A) Joule per Coulomb (J/C)
B) Volt per meter (V/m)
C) Joule (J)
D) Newton per Coulomb (N/C)
Answer: C
Explanation: An electron volt is a unit of energy. It represents the
kinetic energy gained by a single electron accelerating through a
potential difference of one volt. 1 eV = 1.602 x 10^-19 J.
6. If the electric potential in a region is constant, what is the electric
field in that region?
A) Uniform non-zero
B) Zero
C) Radially outward
D) Radially inward
Answer: B
Explanation: The electric field is the negative gradient of the potential.
If V is constant, the spatial rate of change is zero, thus E = 0.
7. The capacitance of a parallel-plate capacitor depends on which of the
following factors?
, 4|Page
A) Charge stored
B) Potential difference
C) Plate area and separation
D) Dielectric constant of the material and plate area, only
Answer: C
Explanation: Capacitance is purely a geometric property (and depends
on the dielectric). C = ε0 A / d. It does not depend on the charge Q or
voltage V; those are proportional to each other via C.
8. A capacitor of capacitance C stores charge Q and has potential
difference V. If the charge is doubled to 2Q, what is the new potential
difference?
A) V/2
B) V
C) 2V
D) 4V
Answer: C
Explanation: Since C = Q/V is constant for a given capacitor, V is directly
proportional to Q. Doubling Q doubles V.
9. What happens to the capacitance of a parallel-plate capacitor if a
dielectric material (κ > 1) is inserted filling the gap?
A) Decreases by κ
B) Increases by κ
PHYS 2326 Exam 2026-2027 BANK QUESTIONS WITH
DETAILED VERIFIED ANSWERS EXAM QUESTIONS WILL
COME FROM HERE (100% CORRECT ANSWERS A+ GRADED
1. What is the work done by the electric field when a positive test
charge moves along an equipotential line?
A) Positive
B) Negative
C) Zero
D) Depends on the magnitude of the charge
Answer: C
Explanation: The potential difference between any two points on an
equipotential line is zero. Work is defined as the negative change in
potential energy, W = -qΔV. Since ΔV = 0, the work done is zero.
2. Two point charges are separated by a distance d. If the distance is
doubled, what happens to the electric potential energy of the system?
A) It doubles
B) It is halved
C) It quadruples
D) It remains the same
Answer: B
,2|Page
Explanation: The electric potential energy U is proportional to 1/r (U =
kq1q2/r). If r is doubled, U becomes half of its original value.
3. What is the net electric potential at the exact center of an electric
dipole?
A) Zero
B) Infinite
C) Non-zero positive
D) Non-zero negative
Answer: A
Explanation: The electric potential is a scalar quantity given by V = kq/r.
At the center of a dipole, the distances from the positive and negative
charges are equal. Thus, the potentials sum to zero (kq/r + k(-q)/r = 0).
4. A metallic sphere of radius R contains a total charge Q. What is the
electric potential at the surface (with V=0 at infinity)?
A) kQ/R^2
B) kQ/R
C) kQ/(2R)
D) Zero
Answer: B
Explanation: Outside a spherically symmetric charge distribution, the
potential is identical to that of a point charge located at the center.
Therefore, at the surface (distance R), V = kQ/R.
,3|Page
5. Which unit is equivalent to one electron volt (eV)?
A) Joule per Coulomb (J/C)
B) Volt per meter (V/m)
C) Joule (J)
D) Newton per Coulomb (N/C)
Answer: C
Explanation: An electron volt is a unit of energy. It represents the
kinetic energy gained by a single electron accelerating through a
potential difference of one volt. 1 eV = 1.602 x 10^-19 J.
6. If the electric potential in a region is constant, what is the electric
field in that region?
A) Uniform non-zero
B) Zero
C) Radially outward
D) Radially inward
Answer: B
Explanation: The electric field is the negative gradient of the potential.
If V is constant, the spatial rate of change is zero, thus E = 0.
7. The capacitance of a parallel-plate capacitor depends on which of the
following factors?
, 4|Page
A) Charge stored
B) Potential difference
C) Plate area and separation
D) Dielectric constant of the material and plate area, only
Answer: C
Explanation: Capacitance is purely a geometric property (and depends
on the dielectric). C = ε0 A / d. It does not depend on the charge Q or
voltage V; those are proportional to each other via C.
8. A capacitor of capacitance C stores charge Q and has potential
difference V. If the charge is doubled to 2Q, what is the new potential
difference?
A) V/2
B) V
C) 2V
D) 4V
Answer: C
Explanation: Since C = Q/V is constant for a given capacitor, V is directly
proportional to Q. Doubling Q doubles V.
9. What happens to the capacitance of a parallel-plate capacitor if a
dielectric material (κ > 1) is inserted filling the gap?
A) Decreases by κ
B) Increases by κ
