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Indian Navy SSR (Sailor) Static Electricity — practice questions

Explore 25 free Static Electricity questions in Indian Navy SSR (Sailor) Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Static Electricity questions and exercises with answers

Showing questions 1–25 of 25.

Electric field due to an INFINITE SHEET of charge with surface charge density σ:Read the answer and worked solution →Two charged spheres each of radius R, charge Q, separated by distance d >> R. Force F between them is:Read the answer and worked solution →Order the atomic models in this chapterRead the answer and worked solution →True or false: Rutherford's two difficultiesRead the answer and worked solution →Which model does this belong to?Read the answer and worked solution →Complete Bohr's first postulateRead the answer and worked solution →True or false: line spectraRead the answer and worked solution →Charge and neutralityRead the answer and worked solution →Assertion and reasonRead the answer and worked solution →Two are true, one is notRead the answer and worked solution →Three of these are wrong. Find the one that holds.Read the answer and worked solution →Tap every problem Bohr's model was built to solveRead the answer and worked solution →Flip and pair: model with its pictureRead the answer and worked solution →Spot the one that does not belongRead the answer and worked solution →Strength or weakness?Read the answer and worked solution →Complete the size of the nucleusRead the answer and worked solution →Reading the models backRead the answer and worked solution →Bohr's postulatesRead the answer and worked solution →Explained, or left unexplained?Read the answer and worked solution →True or false: the nucleusRead the answer and worked solution →Order the argument: why Rutherford's atom should collapseRead the answer and worked solution →Two are true, one is notRead the answer and worked solution →Assertion and reason: modelsRead the answer and worked solution →Spot the one that does not belongRead the answer and worked solution →Flip and pair: problem with the model that solved itRead the answer and worked solution →

Worked practice questions

Electric field due to an INFINITE SHEET of charge with surface charge density σ:

  1. σ/ε₀
  2. σ/(2ε₀)
  3. kσ/r
  4. σε₀
Show answer and solution

Correct answer: B. σ/(2ε₀)

E = σ/(2ε₀) on each side of the sheet. Field is perpendicular to the sheet and uniform (independent of distance). For a conductor's surface, factor is σ/ε₀ (no 2).

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Two charged spheres each of radius R, charge Q, separated by distance d >> R. Force F between them is:

  1. kQ²/R²
  2. kQ²/d
  3. kQ²/d²
  4. kQR/d²
Show answer and solution

Correct answer: C. kQ²/d²

For r >> R, sphere acts like a point charge at its center. F = kQ²/d² — the same Coulomb formula as point charges.

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Order the atomic models in this chapter

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Steps
  1. Thomson: a sphere of positive charge with electrons embedded in it
  2. Rutherford: mass and positive charge concentrated in a tiny nucleus
  3. Bohr: electrons in stable stationary orbits, from three postulates
Thomson, then Rutherford, then Bohr, each answering the last one's failure. Source: syllabus Physics, Ch 12 Atoms.

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