NEET Physics / AI question bank / NCERT Class 12 / Electrostatics
Electric Charges and Fields: NEET questions with solutions
NEET tests this chapter through quantisation of charge, Coulomb-force ratios, the vector sum of fields from several charges, dipole fields and torque, and flux through closed surfaces by Gauss's law. Marks are lost by adding fields as plain numbers, by using 1/r² for a dipole, by counting charges outside a Gaussian surface, and by forgetting that a dipole feels a net force only in a non-uniform field.
Also called: electrostatics · Coulomb's law · Gauss's law · electric field
Questions
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- Q1A plastic comb, initially neutral, is run through dry hair and ends up with a charge of −4.8 μC. Taking e = 1.6 × 10⁻¹⁹ C, how many…
Basic properties of electric chargeEasySingle correct
- Q2Two small charged spheres in air repel each other with a force F. The charge on each sphere is doubled and the distance between their…
Coulomb's lawEasySingle correct
- Q3Point charges of +2 μC and +8 μC are fixed 30 cm apart in air. At which point on the line joining them is the net electric field zero?
Electric fieldMediumSingle correct
- Q4A short electric dipole produces a field of magnitude E at a point on its axis at distance r from its centre. What is the field at a point…
Electric dipoleMediumSingle correct
- Q5A student draws the field-line pattern for a pair of point charges and writes four rules beside it. Which of the rules are correct?
Electric field linesMediumStatement based
- Q6A closed surface encloses point charges of +3 μC and −5 μC. A third charge of +4 μC lies just outside the surface. Taking ε₀ = 8.854 × 10⁻¹²…
Gauss's lawMediumSingle correct
- Q7A very large, thin, flat non-conducting sheet carries a uniform surface charge density σ = 8.85 × 10⁻⁹ C m⁻². What are the magnitudes of the…
Applications of Gauss's lawEasySingle correct
- Q8Charges +q, +q and −q are placed at the three corners of an equilateral triangle of side a. Using k = 1/(4πε₀), what is the magnitude and…
Electric fieldHardSingle correct
- Q9An electric dipole sits in a uniform electric field with its moment tilted at an angle to the field. Read the Assertion (A) and Reason (R)…
Dipole in a uniform external fieldMediumAssertion–Reason
- Q10A small electric dipole is held at some distance from a fixed point charge +Q, with its dipole moment pointing directly away from Q (that…
Dipole in a non-uniform fieldHardSingle correct
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