Many important questions are formed in competitive exams like CUET, JEE, NEET, and boards from Class 12 Physics Chapter 1. Electrostatics is the branch of physics that deals with the properties of charges at rest and slow-moving electric charges. Below, we have provided Important Questions from Class 12 Physics Chapter 1 Electrostatics for your CUET preparation. You can check it here for revision purposes.
Electrostatics Class 12 CUET Questions and Answers
We’ve compiled a list of important questions about the Electrostatics physics class 12 chapter 1 that you should not miss while studying for your CUET Exams.
Electrostatics MCQ for CUET
Q.1. The electrostatic force on a small sphere of charge 0.2 µC due to another small sphere of charge –0.4 µC in air is 0.4 N. The distance between the two spheres is
(a) 4.2 × 10–6 m (b) 4.2 × 10–3 m
(c) 1.8 × 10–3 m (d) 1.8 × 10–6 m
A.1. (b)
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Q.2. A charge 10 µC is placed at the centre of a hemisphere of radius R = 10 cm as shown. The electric flux through the hemisphere (in MKS units) is
(a) 20 × 105 (b) 10 × 105
(c) 6 × 105 (d) 2 × 105
A.2. (c)
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Q.3. The figure below shows the electric field lines due to two positive charges. The magnitudes EA, EB and EC of the electric fields at points A, B, and C respectively are related as
(a) EA > EB > EC (b) EB > EA > EC
(c) EA = EB > EC (d) EA > EB = EC
A.3. (a)
Q.4. The given figure shows some equipotential lines distributed in space. A charged object is moved from point A to point B.
(a) work done in figure (i) is the greatest.
(b) work done in figure (iii) is the least.
(c) work done is the same in figure (i), (ii) and (iii).
(d) work done in figure (iii) is greater than figure (ii) but equal to than in figure (i).
A.4. (c)
Q.5. A parallel plate air capacitor has a capacitance C. When it is half filled with a dielectric of dielectric constant 5, the percentage increase in the capacitance will be
(a) 400% (b) 66.6% (c) 33.3% (d) 200%
A.5. (b)
Q.6. Two point charges Q and –3Q are placed at some distance apart. If the electric field at the location of Q is E then at the location of –3Q, It is
(a) –E (b) E/3 (c) –3 E (d) –E/3
A.6. (b)
Q.7. The radius of a soap bubble whose potential is 16 V is doubled. The new potential of the bubble is
(a) 2V (b) 4V (c) 8V (d) 16V
A.7. (c)
Q.8. At a point 20 cm from the centre of a uniformly charged dielectric sphere of radius 10 cm, the electric field is 100 V/m. The electric field at 3 cm from the centre of the sphere will be
(a) 150 V/m (b) 125 V/m
(c) 120 V/m (d) Zero
A.8. (c)
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Q.9. The correct statement about electric dipole is
(a) The total charge of an electric dipole is non-zero.
(b) The electric field of an electric dipole at far-off distances (r) varies as 1/r2.
(c) The dipole moment vector of an electric dipole points from –q to +q.
(d) The electric dipole moment of CO2 molecule is non-zero in electric field free region.
A.9. (c)
Q.10. The ratio of magnitude of electrostatic force and gravitational force for an electron and a proton is
(a) 6.6 × 1039 (b) 2.4 × 1039
(c) 6.6 × 1029 (d) 2.4 × 1029
A.10. (b)
Electrostatics Assertion Reason Questions for CUET
In each of the following questions, a statement of Assertion (A) is given and a corresponding statement of Reason (R) is given just below it. Of the statements, pick the correct answer as :
Electrostatics CASE BASED MCQs for CUET
Read the passage given below and answer the following questions.
DIELECTRIC SLAB
A dielectric slab is a substance which does not allow the flow of charges through it but permits them to exert electrostatic forces on one another.
When a dielectric slab is placed between the plates, field E0 polarises the dielectric. This induces charge –Qp on the upper surface and +Qp on the lower surface of the dielectric. These induced charges set up a field Ep inside the dielectric in the opposite direction of E0 as shown.
Q.1. In a parallel plate capacitor, the capacitance increases from 4 µF to 80 µF, on introducing a dielectric medium between the plates. What is the dielectric constant of the medium?
(a) 10 (b) 20 (c) 50 (d) 100
A.1. . (b)
Q.2. If dielectric constant and dielectric strength be denoted by K and X respectively, then a material suitable for use as a dielectric in a capacitor must have
(a) high K and high X (b) high K and low X
(c) low K and high X (d) low K and low X.
A.2. (c)
Q.3. A dielectric introduced between the plates of a parallel plate condenser
(a) decreases the electric field between the plates
(b) increases the capacity of the condenser
(c) increases the charge stored in the condenser
(d) increases the capacity of the condenser
A.3. (d)
Q.4. A parallel plate capacitor of capacitance 1 pF has separation between the plates is d. When the distance of separation becomes 2d and wax of dielectric constant x is inserted in it the capacitance becomes 2 pF. What is the value of x?
(a) 2 (b) 4 (c) 6 (d) 8
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A.4. (b).
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