Electrostatics — Practice Quiz
Maharashtra Board · Class 12 · Physics
Try a 4-question quiz on Electrostatics for Maharashtra Board Class 12 Physics: tap an answer to check it and see why.
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Quick Quiz: Electrostatics
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What is the SI unit of electric field intensity?
Two point charges +2μC and -3μC are placed 30 cm apart in air. Calculate the electric field at the midpoint between them.
A parallel plate capacitor has plates of area 0.02 m² separated by 2 mm in air. What is its capacitance?
What happens to the capacitance of a parallel plate capacitor when a dielectric of dielectric constant k is inserted between the plates?
Sample Questions
Which of the following statements about electric potential are correct?
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Electric potential is a scalar quantity, Electric potential decreases as we move away from a positive charge, Electric potential is measured in volts, Work done against electric field increases potential energy
Electric potential is indeed a scalar quantity measured in volts. For a positive charge, potential decreases with distance (V ∝ 1/r). Work done against electric field increases potential energy. Potential at infinity is taken as zero reference, not maximum.
Gauss's law is applicable only for symmetric charge distributions.
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False
Gauss's law is universally applicable for any charge distribution. However, it is useful for calculating electric field only when there is sufficient symmetry in the charge distribution.
Three capacitors of 2μF, 4μF, and 6μF are connected in parallel. What is the equivalent capacitance?
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12μF
For capacitors in parallel: Ceq = C₁ + C₂ + C₃ = 2μF + 4μF + 6μF = 12μF. In parallel combination, capacitances add directly.
Match the following physical quantities with their SI units:
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Electric field - V/m
Electric field is measured in V/m (or N/C), electric potential in volts (V), capacitance in farads (F), and electric charge in coulombs (C).
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