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Karnataka PUC II Electromagnetic Waves — practice questions — page 2

Explore 116 free Electromagnetic Waves questions in Karnataka PUC II Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Electromagnetic Waves questions and exercises with answers

Showing questions 31–60 of 116.

The magnetic moment vector m of a bar magnet pointsRead the answer and worked solution →Lenz's law is a direct consequence ofRead the answer and worked solution →Self-inductance of a long solenoid of length l, cross-section A, with n turns per unit length isRead the answer and worked solution →The speed of an EM wave in vacuum equals:Read the answer and worked solution →NEET · Physics · EM Spectrum — Order by FrequencyRead the answer and worked solution →NEET · Physics · EM Spectrum — Increasing FrequencyRead the answer and worked solution →Order the steps of EM wave generation by an accelerating chargeRead the answer and worked solution →Order by Wavelength: EM Spectrum (ISC 12)Read the answer and worked solution →Which additional current did Maxwell propose to remove the inconsistency?Read the answer and worked solution →Maxwell argued that a magnetic field is generated not only by a current but also by a:Read the answer and worked solution →Who experimentally demonstrated the existence of electromagnetic waves in 1885?Read the answer and worked solution →According to Maxwell's theory, which charges radiate electromagnetic waves?Read the answer and worked solution →A basic source of electromagnetic waves is which arrangement of charge?Read the answer and worked solution →Microwaves are suitable for radar systems in aircraft navigation because of their:Read the answer and worked solution →In an electromagnetic wave, the electric and magnetic fields are:Read the answer and worked solution →Relative to the direction of propagation, the two fields of an electromagnetic wave are:Read the answer and worked solution →The value of c derived by Maxwell equals the speed of light obtained from which measurements?Read the answer and worked solution →The energy carried by a propagating electromagnetic wave comes at the expense of the:Read the answer and worked solution →Cellular phones transmit voice communication using waves in which band?Read the answer and worked solution →Infrared radiation keeps the Earth warm through which effect?Read the answer and worked solution →Most ultraviolet radiation is absorbed in which layer of the atmosphere?Read the answer and worked solution →The electromagnetic spectrum stretches from gamma rays up to which waves?Read the answer and worked solution →In a microwave oven, the frequency is chosen to match the resonant frequency of:Read the answer and worked solution →Ultraviolet radiation can be focussed into narrow beams for which surgical use?Read the answer and worked solution →Whose technological use of electromagnetic waves led to the revolution in communication?Read the answer and worked solution →Whose set of equations predicted electromagnetic waves?Read the answer and worked solution →The extra term Maxwell added to Ampere's law is the:Read the answer and worked solution →Electromagnetic waves are produced by charges that are:Read the answer and worked solution →Who first demonstrated electromagnetic waves experimentally?Read the answer and worked solution →Infrared waves are also referred to as:Read the answer and worked solution →

Worked practice questions

The magnetic moment vector m of a bar magnet points

  1. Along the field at the equatorial point
  2. From south to north pole, inside the magnet
  3. From north to south, externally
  4. Perpendicular to the magnet's length
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Correct answer: B. From south to north pole, inside the magnet

By convention, m points from S pole to N pole within the magnet — same direction as B inside (which closes the external N → S loop).

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Lenz's law is a direct consequence of

  1. Conservation of charge
  2. Conservation of momentum
  3. Conservation of energy
  4. Conservation of magnetic monopoles
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Correct answer: C. Conservation of energy

The induced current always opposes the change in flux because if it aided the change, it would create energy from nothing — violating energy conservation.

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Self-inductance of a long solenoid of length l, cross-section A, with n turns per unit length is

  1. L = μ₀ A / (n² l)
  2. L = μ₀ n² A l
  3. L = μ₀ n A / l
  4. L = μ₀ n l / A
Show answer and solution

Correct answer: B. L = μ₀ n² A l

B = μ₀nI inside; Φ_B per turn = μ₀nI·A total linkage N Φ = (nl)(μ₀nIA) = μ₀n²AlI. **So L = μ₀n²Al.**

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More Physics topics

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