Class 12 Physics MCQ Chapter 1 Electric Charge and Fields Solutions English Medium to each chapter is provided in the list so that you can easily browse through different chapters Class 12 Physics MCQ Chapter 1 Electric Charge and Fields Question Answer in English and select need one. AHSEC Class 12 Physics Objective Type Question Answer As Per AHSEC New Book Syllabus Download PDF. AHSEC Physics MCQ Class 12 Solutions.
Class 12 Physics MCQ Chapter 1 Electric Charge and Fields
Also, you can read the NCERT book online in these sections Solutions by Expert Teachers as per Central Board of Secondary Education (CBSE) Book guidelines. AHSEC Class 12 Physics Multiple Choice Solutions in English Medium are part of All Subject Solutions. Here we have given AHSEC Class 12 Physics MCQ Question Answer English Medium for All Chapters, You can practice these here.
Electric Charge and Fields
Chapter: 1
| MCQs |
Choose the correct option:
1. An electric dipole is placed at an angle of 30° to a non-uniform electric field. The dipole will experience:
(a) A torque only.
(b) A translational force only in the direction of the field.
(c) A translational force only in a direction normal to the direction of the field.
(d) A torque as well as a translational force.
Ans: (d) A torque as well as a translational force.
2. The electric field intensity due to a dipole of length 10 cm and having a charge of 500 µC at a point on the axis at a distance 20 cm from the positive charge in air is:
(a) 9.28 × 107 × N/C
(b) 6.25 × 107 × N/C
(c) 13.1 × 1011 × N/C
(d) 20.5 × 107 × N/C
Ans: (b) 6.25 × 107 × N/C
3. The surface considered for Gauss’s law is called:
(a) Closed surface.
(b) Spherical surface.
(c) Gaussian surface.
(d) Plane surface.
Ans: (c) Gaussian surface.
4. In a region where electric field intensity is 5 N/C, 50 electric lines of force are crossing per square metre. The number of electric lines of force crossing per square metre where electric field intensity is 20 N/C will be:
(a) 30
(b) 500
(c) 200
(d) 150
Ans: (c) 200
5. Two point charges repel each other with a force of 100 N. One of the charges is increased by 10% and the other is reduced by 10%. The new force of repulsion at the same distance would be:
(a) 100 N
(b) 121 N
(c) 99 N
(d) 141 N
Ans: (c) 99 N
6. The force per unit charge is known as:
(a) Electric flux.
(b) Electric field.
(c) Electric potential.
(d) Electric current.
Ans: (b) Electric field.
7. Eight dipoles of charges of magnitude e are placed inside a cube. The total electric flux coming out of the cube will be:
(a) 8e/ɛ0
(b) 16e/ɛ0
(c) e/ɛ0
(d) Zero.
Ans: (d) Zero.
8. Two point charges of +2 µC and + 6 µC repel each other with a force of 12 N. If each is given an additional charge of -4 µC, then new force will be:
(α) +4 N.
(b) 3 N.
(c) 48 N.
(d) -4 N.
Ans: (d) -4 N.
9. Electric field lines provide information about:
(a) Field strength.
(b) Direction.
(c) Nature of charge.
(d) All of these.
Ans: (d) All of these.
10. A given charge is situated at a certain distance from the electric dipole in the end- on position, experiences a-force F. If the distance of the charge is doubled, the force acting on the charge will be:
(a) 2 F
(b) F/2
(c) F/5
(d) F/8
Ans: (d) F/8
11. The electric flux through each face of a hollow cube of side 5 cm if a charge of 8.85 × 10– 6 C is placed at its centre is:
(a) 1.67 × 105 Nm2C-1
(b) 2 × 106 Nm2 C–
(c) 4.7 × 103 Nm2C-1
(d) 8.67 × 103 Nm2 C-1
Ans: (a) 1.67 × 105 Nm2C-1
12. The unit of electric dipole moment is:
(a) Newton.
(b) Coulomb.
(c) Farad.
(d) Debye.
Ans: (d) Debye.
13. If Ea be the electric field strength due to a short dipole on the axial line and Ee that on the equatorial line at the same distance from the centre of dipole, then,:
(a) Ea = 2Ee
(b) 2Ea = Ee
(c) Ea = Ee
(d) None of the above.
Ans: (a) Ea = 2Ee
14. Three charges each equal to q are placed at the corners of an equilateral triangle. If force between any two charges is F, then net force on the triangle will be:
(a) 3 F.
(b) 2 F.
(c) Zero.
(d) √2F.
Ans: (c) Zero.
15. Which of the following statements is not true about Gauss’s law?
(a) Gauss’s law is true for any closed surface.
(b) The term q on the right side of Gauss’s law includes the sum of all charges enclosed by the surface.
(c) Gauss’s law is not very useful in calculating electrostatic fields when the system has some symmetry.
(d) Gauss’s law is based on the inverse square dependence on distance contained in the coulomb’s law.
Ans: (c) Gauss’s law is not very useful in calculating electrostatic fields when the system has some symmetry.
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