physics : class12 Scalar Addition of Electric Potential : Superposition Principle : Electrostatics MCQ Questions and Answers
Practice important
Scalar Addition of Electric Potential
MCQ questions and answers.
Page 3
of
3
|
30
MCQ Questions
1. The electric potential at a point due to several point charges is calculated by:
A.
Adding the electric potentials algebraically
B.
Adding only the magnitudes of the charges
C.
Multiplying all individual potentials
D.
Adding the electric fields vectorially
Correct Answer:
Adding the electric potentials algebraically
Explanation:
Electric potential is a scalar quantity, so the total potential is the algebraic sum of the potentials produced by all individual charges.
2. Two charges produce potentials of +5 V and +3 V at a point. What is the total electric potential at that point?
A.
+2 V
B.
+8 V
C.
-2 V
D.
-8 V
Correct Answer:
+8 V
Explanation:
The potentials are both positive, so they are added algebraically: V = 5 V + 3 V = 8 V.
3. At a point, two charges produce potentials of +10 V and -4 V. What is the resultant potential?
A.
+14 V
B.
-14 V
C.
+6 V
D.
-6 V
Correct Answer:
+6 V
Explanation:
The total potential is the algebraic sum: V = (+10 V) + (-4 V) = +6 V.
4. A point is at a potential of -7 V due to one charge and -2 V due to another charge. What is the total potential?
A.
-9 V
B.
-5 V
C.
+5 V
D.
+9 V
Correct Answer:
-9 V
Explanation:
Both individual potentials are negative, so their algebraic sum is V = -7 V - 2 V = -9 V.
5. If two equal positive point charges are placed symmetrically about a point, and each produces a potential V at that point, the total potential is:
A.
Zero
B.
V
C.
2V
D.
V divided by 2
Correct Answer:
2V
Explanation:
Potential is a scalar, so the two equal contributions add directly: V_total = V + V = 2V.
6. A charge produces an electric potential of 12 V at a point. Another charge produces -12 V at the same point. What is the total potential?
A.
+24 V
B.
-24 V
C.
0 V
D.
+12 V
Correct Answer:
0 V
Explanation:
The equal and opposite scalar potentials cancel: V_total = (+12 V) + (-12 V) = 0 V.
7. Three charges produce potentials of 2 V, 4 V, and 6 V at a point. What is the total potential?
A.
4 V
B.
8 V
C.
10 V
D.
12 V
Correct Answer:
12 V
Explanation:
The total potential is the sum of all individual potentials: V_total = 2 V + 4 V + 6 V = 12 V.
8. A positive charge produces +9 V and a negative charge produces -3 V at a point. The total potential at the point is:
A.
+12 V
B.
+6 V
C.
-6 V
D.
-12 V
Correct Answer:
+6 V
Explanation:
Using algebraic addition, V_total = (+9 V) + (-3 V) = +6 V.
9. If the potentials due to four charges at a point are +2 V, -1 V, +5 V, and -3 V, what is the resultant potential?
A.
+3 V
B.
+5 V
C.
-3 V
D.
-5 V
Correct Answer:
+3 V
Explanation:
Adding the scalar potentials gives V_total = 2 V - 1 V + 5 V - 3 V = 3 V.
10. The electric potential at a point due to a charge q is V. If another identical charge is placed at the same distance and also produces V at that point, the combined potential is:
A.
V divided by 2
B.
V
C.
2V
D.
V squared
Correct Answer:
2V
Explanation:
The potentials from identical charges are scalar quantities and add directly, giving V_total = V + V = 2V.