Provided below is an updated list of important objective questions from the chapter Electric Charge and Coulomb's Law from board exams point of view. Students preparing for 12th board exams are advised to practice these set of questions (after properly going through the respective theoretical sections) in order to strengthen the conceptual grasp and score the highest in objective section of the actual physics paper.
All the questions given below are 12th board level objective type questions with single option correct.
1. How many electrons from a neutral sphere should be extracted in order to provide it a charge of magnitude 1 coulomb?
B) 6.25 × 10⁸
C) 6.23 × 10²³
D) None of these
2. Choose the correct statement.
-
A) The force of attraction between two like charges is inversely proportional to the separation between the two charges.
B) The force of attraction between two like charges is inversely proportional to the square of distance between them.
C) The force of repulsion between two like charges is inversely proportional to the square of distance between them.
D) The force of repulsion between two like charges is directly proportional to the square of the distance between them.
3. The charge possessed by an electron is
-
A) +2 × 10⁻²¹ C
B) -2 × 10⁻²¹ C
C) -1.6 × 10⁻¹⁹ C
D) None of these
4. If ε be the absolute permittivity of a medium and εₒ be the absolute permittivity of free space, then the relative permittivity of the medium can be expressed as
B) ε×εₒ
C) ε+εₒ
D) ε-εₒ
5. The force between two electrons separately by a distance r is proportional to
- A) r
B) r²
C) 1/r
D) 1/r²
6. Unit of εₒ is
- A) N/m
B) F/m
C) C/V
D) None of these
7. The permittivity of free space is
B)1.6 × 10⁻¹⁹ C
C) 8.85 × 10⁻¹² F/m
D) None of these.
8. Coulomb's Force is
- A) Central Force
B) Electric Force
C) Conservative Force
D) All of the above
9. Which of the following charges cannot exit individually
B) 6.4 × 10⁻¹⁹ C
C) 2.4 × 10⁻¹⁹ C
D) 1.6 × 10⁻¹⁹ C
10. If the separation between two point charges is halved, then the force between them will get
B) one-fourth
C) doubled
D) None of these
11. Say the force between two point charges separated by a distance r is F. Now if the values of charges are doubled and the separation r is halved, then the electrostatic force will become
B) 4F
C) 16F
D) 64F
12. A static electric charge produces
B) electric field only
C) magnetic and electric fields both
D) Neither electric nor magnetic field
13. SI unit of electric field is
B) newton(N)
C) volt(V)
D) newton per coulomb (N/C)
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