Class 12 Physics Chapter 1 Electric Charges and Fields MCQs Questions For NEET - YB Study

# MCQs On Electric charge and Fields For NEET pdf

Check your knowledge by solving MCQ on Electric Charge And fields with answers Pdf. Below MCQs will help learners for preparing NEET examinations and will be able to score better as all the resources required to study of Electric Charge And Fields are provided here. We tried to simplify the complexities of some of the topics in the form of Electric Charge And Fields multiple choice questions and answers so that preparation becomes easy for the NEET aspirants.

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## Multiple Choice Questions On Electric charge and Fields with answers

1. At a distance r, two equal charges are kept and they exert a force F on each other. What is the force acting on each charge, if the distance between them is doubled and charges are halved?

(a) F/4

(b) 4 F

(c) F/16

(d) F/8

2. In nature, the electric charge of any system is always equal to__________

(a) half integral multiple of the least amount of

charge

(b) zero

(c) square of the least amount of charge

(d) integral multiple of the least amount of charge

3. Consider a neutral conducting sphere. A positive point charge is placed outside the sphere. The net charge on the sphere is then__________

(a) negative and distributed uniformly over its surface.

(b) negative and appears only at the point on the

sphere closest to the point charge

(c) negative and distributed non-uniformly over its entire surface of the sphere

(d) zero

4. Two point charges placed at a distance 'r' in air exert a force 'F'. The distance at which they exert same force when placed in a certain medium(dielectric constant K) is _______

(a) rK

(b) r/K

(c) r K

(d) r √K

5. What equal charges should to be placed one earth and moon to neutralize their gravitational attraction ? (mass of earth = 1025 kg, mass of moon= 1023 kg)

(a) 8.6 × 10¹³ C

(b) 6.8 × 10²⁶ C

(c) 8.6 × 10³C

(d) 9 × 10⁶ C

6. When a plastic comb is passed through dry hair, the charge acquired by the comb is__________

(a) always negative

(b) always positive

(c) sometimes negative

(d) none of the above

7. The value of absolute permittivity of free space is______

(a) 9×10-⁹C-²Nm²

(b) 9×10⁹C-²Nm²

(c) 8.85×10-¹² C²N-¹m-²

(d) 8.85×10¹² C²Nm-²

8. For a dipole, the value of each charge is 10–10 stat coulomb and their separation is 1Å, then its dipole moment is _______

(a) one debye

(b) 2 debye

(c) 10–3 debye

(d) 3 × 10–20 debye

9. The electric potential and field at a point due to an electric dipole are proportional to _____

(a) r, r–¹

(b) r–¹, r–²

(c) r–², r–3

(d) r–², r–²

10. When an electric dipole p r is kept in a uniform electric field Er then for what value of angle between p r and E r will the torque be maximum ?

(a) 90°

(b) 0°

(c) 180°

(d) 45°

11. What will be the ratio of electric field at a point on the axis and an equidistant point on the equatorial line of a dipole________

(a) 1 : 2

(b) 2 : 1

(c) 4 : 1

(d) 1 : 4

12. For a dipole q = 2 × 10–⁶ C ; d = 0.01m; find the maximum torque on the dipole if

E = 5 × 10⁵N/C

(a) 1 × 10–³ Nm–¹

(2) 10 × 10–³ Nm–¹

(3) 10 × 10–³ Nm

(4) 1 × 10–⁴ Nm

13. Electric field due to a single charge is_____________

(a) assymetric

(b) cylindrical symmetric

(c) spherical symmetric

(d) none of the above

14. Electric field due to an electric dipole is____________

(a) spherical symmetric

(b) cylindrical symmetric

(c) assymetric

(d) none of the above

15. charged conducting sphere has diameter 2.4 m and surface charge density 10 µC/m²Electric flux passing through its surface will be _________

(a) 2 × 10⁷ Nm2/C

(b) 16 × 10⁷ Nm2/C

(c) 1 × 10⁶ Nm2/C

(d) 2.2 × 10⁸Nm2/C

16. A straight cylindrical wire of infinite length produces electric field of strength 9 × 10⁴ ​N/C at a distance of 10 cm. Linear charge density of the wire is_________

(a) 0.1 µC/m

(b) 0.5 µC/m

(c) 50 µC/m

(d) 10 µC/m

17. For a uniformly charged sphere, the electric field from its centre _______

(a) increases linearly upto the surface

(b) decreases linearly upto the surface

(c) remains zero upto the surface

(d) first increases and then decreases upto the surface

18. The dimensional formula of electric flux is________

(a) L³MT³I¹

(b) L²MT−³I¹

(c) L³MT−³I−¹

(d) L−3³MT−3I

19. What is the value of minimum force acting between two charges placed at 1m apart from each other__________

(a) Ke

(b) Ke/4

(c) Ke2

(d) Ke2/2

20. An electron of mass me initially at rest moves through a certain distance in a uniform electric field in time t¹. A proton of mass mp also initially at rest takes time t² to move through an equal distance in this uniform electric field. Neglecting the effect of gravity, the ratio of t²/t¹ is nearly equal to______

(a) 1

(b) (mp/me)½

(c) (me/mp)½

(d) 1836

21. There is a uniform electric field of strength 10³ ​V/m along y–axis. A body of mass 1 g and charge 10–⁶C is projected into the field from origin along positive x–axis with a velocity 10 m/s. Its speed in m/s after 10 s is :- (neglect gravitation)

(a) 10

(b) 5 √2

(c) 10√ 2

(4) 2

22. When a plastic comb is passed through dry hair, the charge acquired by the comb is___________

(a) always negative

(b) always positive

(c) sometimes negative

(d) none of the above

23.The cause of quantization of electric charge is___________

(a) transfer of electrons

(b) transfer of protons

(c) transfer of integral number of electrons

(d) none of the above

24. At a given distance from the centre of electric dipole, field intensity on axial line is k times the field intensity on equatorial line, where k =

(a) 2

(b) 4

(c) 1

(d) 3

25. The number of electric lines of force radiating from a closed surface in vacuum is 1.13×1011. The charge enclosed by the surface is__________

(a) 1C

(b) 1μC

(c) 0.1C

(d) 0.1μC