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ISC Class 12 Electric Charges and Fields — practice questions

Explore 50 free Electric Charges and Fields questions in ISC Class 12 Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Electric Charges and Fields questions and exercises with answers

Showing questions 1–30 of 50.

A body acquires a negative charge byRead the answer and worked solution →The reciprocal of resistivity ρ is calledRead the answer and worked solution →A Wheatstone bridge with arms P, Q, R and S is balanced whenRead the answer and worked solution →The force on a charge q moving with velocity v in a magnetic field B (Lorentz magnetic force) isRead the answer and worked solution →A current-carrying straight wire of length l in a magnetic field B experiences force of magnitudeRead the answer and worked solution →Drop each fact inside or outsideRead the answer and worked solution →NEET · Physics · Electric Charges & Fields · Electric Field — TypingRead the answer and worked solution →Capacitance of a parallel-plate capacitor is:Read the answer and worked solution →A 5 µF capacitor is charged to 200 V. The energy stored in it isRead the answer and worked solution →Electric potential at infinity in the standard syllabus convention is taken asRead the answer and worked solution →The SI unit of capacitance isRead the answer and worked solution →An equipotential surface is perpendicular to:Read the answer and worked solution →Energy stored in a capacitor equals:Read the answer and worked solution →When the separation between the plates of an air parallel-plate capacitor is doubled (keeping plate area constant), the capacitanceRead the answer and worked solution →Capacitors in series share:Read the answer and worked solution →Match each electrostatic termRead the answer and worked solution →NEET · Physics · Electric Charges & Fields · Quantity to FormulaRead the answer and worked solution →NEET · Physics · Electric Charges & Fields · Conductor or InsulatorRead the answer and worked solution →NEET · Physics · Electric Charges & Fields · Gauss's Law — MemoryRead the answer and worked solution →NEET · Physics · Electric Charges & Fields · Tap Like-Charge PairsRead the answer and worked solution →NEET · Physics · Electric Charges & Fields · Field at a PointRead the answer and worked solution →NEET · Physics · Electric Charges & Fields · Dipole or Monopole FieldRead the answer and worked solution →NEET · Physics · Electric Charges & Fields · Dipole Moment — Gap FillRead the answer and worked solution →NEET · Physics · Electric Charges & Fields · Tap Field-Line PropertiesRead the answer and worked solution →NEET · Physics · Electric Charges & Fields · Field Inside or OutsideRead the answer and worked solution →NEET · Physics · Electric Charges & Fields · Capacitance — Gap FillRead the answer and worked solution →NEET · Physics · Electric Charges & Fields · Field of a Charged ShellRead the answer and worked solution →An electric dipole of dipole moment $\vec{p}$ is placed in a UNIFORM electric field $\vec{E}$. The torque experienced isRead the answer and worked solution →The smallest charge that can exist freely in nature isRead the answer and worked solution →The electric field at a distance $r$ from a POINT charge $q$ (in vacuum) has magnitudeRead the answer and worked solution →

Worked practice questions

A body acquires a negative charge by

  1. Gaining protons
  2. Losing protons
  3. Losing electrons
  4. Gaining electrons
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Correct answer: D. Gaining electrons

Protons are bound in the nucleus and are not transferred in everyday charging. A body becomes negative by gaining electrons and positive by losing them.

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The reciprocal of resistivity ρ is called

  1. Conductivity (σ = 1/ρ)
  2. Conductance
  3. Permittivity
  4. Capacitance
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Correct answer: A. Conductivity (σ = 1/ρ)

σ = 1/ρ — units S·m⁻¹ (siemens per metre). 'Conductance' G = 1/R, distinct from conductivity.

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A Wheatstone bridge with arms P, Q, R and S is balanced when

  1. P / S = Q / R
  2. P / Q = R / S
  3. P · Q = R · S
  4. P + Q = R + S
Show answer and solution

Correct answer: B. P / Q = R / S

At balance no current flows through the galvanometer, giving P/Q = R/S (equivalently PS = QR). The other relations are not the balance condition.

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More Physics topics

Moving Charges and MagnetismCurrent ElectricityElectromagnetic Induction & Alternating CurrentSemiconductor ElectronicsRay Optics and Optical InstrumentsElectromagnetic WavesAtoms and NucleiDual Nature of Radiation and Matter