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Assam CEE Electric Charges and Fields — practice questions

Explore 29 free Electric Charges and Fields questions in Assam CEE 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 1–29 of 29.

Quantisation of electric charge means:Read the answer and worked solution →If 10⁹ electrons leave a body every second, the time required to accumulate a total charge of 1 C is approximately:Read the answer and worked solution →A charge of −12 nC is given to a body. The number of excess electrons on the body is:Read the answer and worked solution →Coulomb's law in vacuum is F = (1/4πε₀)(q₁q₂/r²). The value of 1/4πε₀ is approximately:Read the answer and worked solution →Two point charges q₁ and q₂ separated by distance r in vacuum experience force F. If both charges are doubled AND the distance is halved, the new force is:Read the answer and worked solution →The SI unit of electric field is:Read the answer and worked solution →The electric field on the **equatorial line** of a dipole (perpendicular bisector, r >> a) has magnitude:Read the answer and worked solution →A dipole of moment p is placed in a uniform external field E. The torque on the dipole is:Read the answer and worked solution →A dipole of moment 10⁻²⁹ C·m is placed in a uniform field of 10⁵ N/C at angle 30°. The torque on the dipole is:Read the answer and worked solution →If a point charge is placed **outside** a closed Gaussian surface, the total flux through the surface is:Read the answer and worked solution →For a uniformly charged thin spherical shell of radius R and total charge Q, the electric field INSIDE the shell (r < R) is:Read the answer and worked solution →Linear charge density λ has SI units:Read the answer and worked solution →NEET · Physics · Electric Charges & Fields · Coulomb's Law — Gap FillRead the answer and worked solution →NEET · Physics · Electric Charges & Fields · Quantity to UnitRead 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 · Force on Dipole in FieldRead the answer and worked solution →NEET · Physics · Electric Charges & Fields · Electric Field — TypingRead the answer and worked solution →NEET · Physics · Electric Charges & Fields · Quantity to FormulaRead 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 →Judge a dipole sitting in a fieldRead the answer and worked solution →Drop each fact inside or outsideRead the answer and worked solution →

Worked practice questions

Quantisation of electric charge means:

  1. Charge can take any continuous value
  2. All free charges are integral multiples of the elementary charge e (1.602 × 10⁻¹⁹ C)
  3. Only positive charges are quantised
  4. Charge is always zero
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Correct answer: B. All free charges are integral multiples of the elementary charge e (1.602 × 10⁻¹⁹ C)

**Quantisation of charge**: q = ne, where n is an integer (positive or negative) and e = 1.602 × 10⁻¹⁹ C (charge on proton; electron has -e). At macroscopic scales (1 μC ≈ 6 × 10¹² electrons) quantisation is unobservable matters only at microscopic level.

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If 10⁹ electrons leave a body every second, the time required to accumulate a total charge of 1 C is approximately:

  1. 200 days
  2. 200 hours
  3. 200 years (≈ 6.25 × 10⁹ seconds)
  4. 2 hours
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Correct answer: C. 200 years (≈ 6.25 × 10⁹ seconds)

**Charge per second:** 10⁹ × 1.6 × 10⁻¹⁹ = 1.6 × 10⁻¹⁰ C/s. **Time for 1 C:** 1 / (1.6 × 10⁻¹⁰) = 6.25 × 10⁹ s = 6.25 × 10⁹ / (365 × 24 × 3600) ≈ **198 years ≈ 200 years**. Shows 1 C is a very large unit for electrostatics.

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A charge of −12 nC is given to a body. The number of excess electrons on the body is:

  1. 7.5 × 10¹⁰
  2. 1.92 × 10⁻²⁷
  3. 7.5 × 10¹⁹
  4. 1.92 × 10¹⁰
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Correct answer: A. 7.5 × 10¹⁰

n = |q|/e = (12 × 10⁻⁹) / (1.6 × 10⁻¹⁹) = **7.5 × 10¹⁰ electrons**. Body is negatively charged → excess electrons (matches the −12 nC sign).

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