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Tamil Nadu HSC (Class 12) Physics — practice by topic

Browse 49 questions across 4 Physics topics. Choose what you want to revise, then open a question to check its answer and worked solution.

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Physics topics

Electrostatics (49)Electromagnetism (17)Equipotential Surfaces (17)Static Electricity (17)

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The fact that any observable charge is an integral multiple of the elementary charge $e$ is known asRead the answer and worked solution →The SI unit of electric field intensity isRead the answer and worked solution →Which charge configuration produces a uniform electric field?Read the answer and worked solution →Electric field lines can never intersect each other becauseRead the answer and worked solution →

Worked practice questions

The fact that any observable charge is an integral multiple of the elementary charge $e$ is known as

  1. conservation of charge
  2. superposition of charges
  3. quantisation of charge
  4. polarisation of charge
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Correct answer: C. quantisation of charge

1. Every charge is transferred as whole electrons, so $q = ne$ with $n = \pm 1, \pm 2, \ldots$ and $e = 1.6\times10^{-19}$ C. 2. Charge cannot exist as a fraction of $e$; this is **quantisation of charge**. 3. Conservation refers to total charge being constant; superposition is about adding forces/fields. _Source: Samacheer Kalvi Class 12 Physics Vol.1, Unit 1 'Electrostatics', §1.1.2 (iii)_

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The SI unit of electric field intensity is

  1. $N\,C$
  2. $C\,N^{-1}$
  3. $N\,m^{-1}$
  4. $N\,C^{-1}$
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Correct answer: D. $N\,C^{-1}$

1. Electric field is force per unit positive charge, $\vec{E} = \vec{F}/q$. 2. Its unit is therefore newton per coulomb, $N\,C^{-1}$ (equivalently $V\,m^{-1}$). 3. The other options are not equivalent to force/charge. _Source: Samacheer Kalvi Class 12 Physics Vol.1, Unit 1 'Electrostatics', §1.3.1_

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Which charge configuration produces a uniform electric field?

  1. a uniformly charged infinite plane sheet
  2. a single point charge
  3. an infinitely long line charge
  4. a uniformly charged spherical shell
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Correct answer: A. a uniformly charged infinite plane sheet

1. For an infinite charged plane, $E = \sigma/2\varepsilon_0$, independent of distance from the sheet. 2. A field of constant magnitude and direction everywhere is a **uniform field**, produced by the infinite plane. 3. Point, line and shell charges all give fields that vary with distance. _Source: Samacheer Kalvi Class 12 Physics Vol.1, Unit 1 'Electrostatics', Evaluation Q.2_

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