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Indian Navy Pilot Electromagnetism — practice questions

Explore 29 free Electromagnetism questions in Indian Navy Pilot Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Electromagnetism questions and exercises with answers

Showing questions 1–29 of 29.

What is the electric field at the centre of a hollow conducting sphere of radius $R$ carrying total charge $Q$?Read the answer and worked solution →The principle that charge can be neither created nor destroyed is:Read the answer and worked solution →Magnetic field at center of a circular loop of radius R carrying current I:Read the answer and worked solution →Torque on a current loop (moment m) in uniform field B:Read the answer and worked solution →Magnetic flux through a surface is:Read the answer and worked solution →Cyclotron frequency for a charged particle in magnetic field B:Read the answer and worked solution →Complete the work-energy theoremRead the answer and worked solution →True or false: conservative forcesRead the answer and worked solution →Conservative or not?Read the answer and worked solution →Reading the theoremRead the answer and worked solution →Assertion and reasonRead the answer and worked solution →Two are true, one is notRead the answer and worked solution →Tap every test for a conservative forceRead the answer and worked solution →Order the reasoning: from work to speedRead the answer and worked solution →Flip and pair: term with meaningRead the answer and worked solution →Spot the one that does not belongRead the answer and worked solution →True or false: energy bookkeepingRead the answer and worked solution →Speeds up, slows down, or neither?Read the answer and worked solution →Applying the work-energy theoremRead the answer and worked solution →True or false: potential energyRead the answer and worked solution →Kinetic or potential?Read the answer and worked solution →Tap every statement true of a closed pathRead the answer and worked solution →Spot the one that does not belongRead the answer and worked solution →Assertion and reason: energyRead the answer and worked solution →Complete the potential energy relationRead the answer and worked solution →Flip and pair: quantity with what it tracksRead the answer and worked solution →Two are true, one is notRead the answer and worked solution →Order the reasoning: why a pendulum keeps swingingRead the answer and worked solution →Conservative or not, in practiceRead the answer and worked solution →

Worked practice questions

What is the electric field at the centre of a hollow conducting sphere of radius $R$ carrying total charge $Q$?

  1. $0$
  2. $\dfrac{kQ}{R^2}$
  3. $\dfrac{kQ}{R^3}$
  4. $\dfrac{kQ}{R}$
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Correct answer: A. $0$

Inside any closed conducting shell with all charge residing on its outer surface, Gauss's law applied to a sphere of radius $r < R$ encloses zero charge so $E = 0$ everywhere inside the cavity.

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The principle that charge can be neither created nor destroyed is:

  1. Conservation of energy
  2. Conservation of charge
  3. Conservation of momentum
  4. Coulomb's law
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Correct answer: B. Conservation of charge

Total charge in an isolated system is conserved. Charge can be transferred between bodies but not created or destroyed. This is a fundamental conservation law in physics.

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Magnetic field at center of a circular loop of radius R carrying current I:

  1. μ₀I / (2πR)
  2. μ₀I / (2R)
  3. μ₀I / (4πR)
  4. μ₀ I R
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Correct answer: B. μ₀I / (2R)

B = μ₀I / (2R) at center of circular loop. **For N turns:** B = μ₀NI / (2R). Direction along axis by right-hand rule.

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