Tamil Nadu Board of Secondary EducationHSC Science Class 12th

Tamil Nadu Board Samacheer Kalvi solutions for Class 12th Physics Volume 1 and 2 Answers Guide chapter 5 - Electromagnetic waves [Latest edition]

Chapter 5: Electromagnetic waves

Evaluation
Evaluation [Pages 282 - 283]

Tamil Nadu Board Samacheer Kalvi solutions for Class 12th Physics Volume 1 and 2 Answers Guide Chapter 5 Electromagnetic wavesEvaluation [Pages 282 - 283]

Multiple choice questions

Evaluation | Q I. 1. | Page 282

The dimension of 1/(mu_0 ∈_0) is

• [LT-1]

• [L2 T-2]

• [L-1 T]

• [L-2 T2]

Evaluation | Q I. 2. | Page 282

If the amplitude of the magnetic field is 3 x 10-6 T, then amplitude of the electric field for a electromagnetic waves is ______.

• 100 V m-1

• 300 V m-1

• 600 V m-1

• 900 V m-1

Evaluation | Q I. 3. | Page 282

Which of the following electromagnetic radiations is used for viewing objects through fog ______.

• microwave

• gamma rays

• X- rays

• infrared

Evaluation | Q I. 4. | Page 282

Which of the following is false for electromagnetic waves.

• transverse

• non-mechanical waves

• longitudinal

• produced by accelerating charges

Evaluation | Q I. 5. | Page 282

Consider an oscillator which has a charged particle oscillating about its mean position with a frequency of 300 MHz. The wavelength of electromagnetic waves produced by this oscillator is ______.

• 1 m

• 10 m

• 100 m

• 1000 m

Evaluation | Q I. 6. | Page 282

The electric and magnetic fields, associated with an electromagnetic wave, propagating along negative X-axis can be represented by ______.

• vec"E" = "E"_circ hat"i" and vec"B" = "B"_circ hat"k"

• vec"E" = "E"_circ hat"k" and vec"B" = "B"_circ hat"j"

• vec"E" = "E"_circ hat"i" and vec"B" = "B"_circ hat"j"

• vec"E" = "E"_circ hat"j" and vec"B" = "B"_circ hat"i"

Evaluation | Q I. 7. | Page 282

In an electromagnetic wave in free space the rms value of the electric field is 3 V m-1. The peak value of the magnetic field is ______.

• 1.414 × 10-8 T

• 1.0 × 10-8 T

• 2.828 × 10-8 T

• 2.0 × 10-8 T

Evaluation | Q I. 8. | Page 282

An e.m. wave is propagating in a medium with a velocity vec"v" = "v" hat"i". The instantaneous oscillating electric field of this e.m. wave is along +y-axis, then the direction of an oscillating magnetic field of the e.m. wave will be along:

• - y direction

• - x direction

• + z direction

• - z direction

Evaluation | Q I. 9. | Page 282

If the magnetic monopole exists, then which of the Maxwell’s equation to be modified?

• oint_"s" vec"E" * "d"vec"A" = "Q"_"enclosed"/∈_circ

• oint_"s" vec"B" * "d"vec"A" = 0

• oint_"l" vec"B" * vec"dl" = mu_0"i"_"c" + mu_0∈_0 "d"/"dt" oint vec"E"*vec"dA"

• oint_"l" vec"E" * vec"dl" = - "d"/"dt"ΦB

Evaluation | Q I. 10. | Page 282

Fraunhofer lines are an example of _______ spectrum.

• line emission

• line absorption

• band emission

• band absorption

Evaluation | Q I. 11. | Page 283

Which of the following is an electromagnetic wave?

• α - rays

• β - rays

• γ - rays

• all of them

Evaluation | Q I. 12. | Page 283

Which one of them is used to produce a propagating electromagnetic wave?

• an accelerating charge

• a charge moving with constant velocity

• a stationary charge

• an uncharged particle

Evaluation | Q I. 13. | Page 283

Let E = E0 sin[106 x -ωt] be the electric field of plane electromagnetic wave, the value of ω is ______.

• 0.3 x 10-14 rad s-1

• 3 x 10-14 rad s-1

• 0.3 x 1014 rad s-1

• 3 x 1014 rad s-1

Evaluation | Q I. 14. | Page 283

Which of the following is NOT true for electromagnetic waves?

• it transports energy

• it transports momentum

• it transports angular momentum

• in vacuum, it travels with different speeds which depend on their frequency

Evaluation | Q I. 15. | Page 283

The electric and magnetic fields of an electromagnetic wave are ______.

• in phase and perpendicular to each other

• out of phase and not perpendicular to each other

• in phase and not perpendicular to each other

• out of phase and perpendicular to each other

Evaluation [Page 283]

Tamil Nadu Board Samacheer Kalvi solutions for Class 12th Physics Volume 1 and 2 Answers Guide Chapter 5 Electromagnetic wavesEvaluation [Page 283]

Evaluation | Q II. 1. | Page 283

What is displacement current?

Evaluation | Q II. 2. | Page 283

What are electromagnetic waves?

Evaluation | Q II. 3. | Page 283

Write down the integral form of modified Ampere’s circuital law.

Evaluation | Q II. 4. | Page 283

Write notes on Gauss' law in magnetism.

Evaluation | Q II. 5. (i) | Page 283

Give two uses of IR radiation.

Evaluation | Q II. 5. (ii) | Page 283

Give two uses of Microwaves.

Evaluation | Q II. 5. (iii) | Page 283

Give two uses of UV radiation.

Evaluation | Q II. 6. | Page 283

What are Fraunhofer lines? How are they useful in the identification of elements present in the Sun?

Evaluation | Q II. 7. | Page 283

Write notes on Ampere-Maxwell law.

Evaluation | Q II. 8. | Page 283

Why are e.m. waves non-mechanical?

Evaluation [Page 283]

Tamil Nadu Board Samacheer Kalvi solutions for Class 12th Physics Volume 1 and 2 Answers Guide Chapter 5 Electromagnetic wavesEvaluation [Page 283]

Evaluation | Q III. 1. | Page 283

Write down Maxwell equations in integral form.

Evaluation | Q III. 2. (a) | Page 283

Write a short note on the microwave.

Evaluation | Q III. 2. (b) | Page 283

Write a short note on the X-ray.

Evaluation | Q III. 2. (c) | Page 283

Write a short note on the radio waves.

Evaluation | Q III. 2. (d) | Page 283

Write a short note on the visible spectrum.

Evaluation | Q III. 3. | Page 283

Discuss the Hertz experiment.

Evaluation | Q III. 4. | Page 283

Explain the Maxwell’s modification of Ampere’s circuital law.

Evaluation | Q III. 5. | Page 283

Explain the importance of Maxwell’s correction.

Evaluation | Q III. 6. | Page 283

Write down the properties of electromagnetic waves.

Evaluation | Q III. 7. | Page 283

Discuss the source of electromagnetic waves.

Evaluation | Q III. 8. | Page 283

Explain the types of emission spectrum.

Evaluation | Q III. 9. | Page 283

Explain the types of absorption spectrum.

Evaluation [Page 284]

Tamil Nadu Board Samacheer Kalvi solutions for Class 12th Physics Volume 1 and 2 Answers Guide Chapter 5 Electromagnetic wavesEvaluation [Page 284]

Numerical problems

Evaluation | Q IV. 1. | Page 284

Consider a parallel plate capacitor whose plates are closely spaced. Let R be the radius of the plates and the current in the wire connected to the plates is 5 A, calculate the displacement current through the surface passing between the plates by directly calculating the rate of change of flux of electric field through the surface.

Evaluation | Q IV. 2. | Page 284

A transmitter consists of LC circuit with an inductance of 1 μH and a capacitance of 1 μF. What is the wavelength of the electromagnetic waves it emits?

Evaluation | Q IV. 3. | Page 284

A pulse of light of duration 10-6 s is absorbed completely by a small object initially at rest. If the power of the pulse is 60 x 10-3 W, calculate the final momentum of the object.

Evaluation | Q IV. 4. | Page 284

Let an electromagnetic wave propagate along the x-direction, the magnetic field oscillates at a frequency of 1010 Hz and has an amplitude of 10-5 T, acting along the y – direction. Then, compute the wavelength of the wave. Also write down the expression for the electric field in this case.

Evaluation | Q IV. 5. | Page 284

If the relative permeability and relative permittivity of the medium is 1.0 and 2.25, respectively. Find the speed of the electromagnetic wave in this medium.

Evaluation

Tamil Nadu Board Samacheer Kalvi solutions for Class 12th Physics Volume 1 and 2 Answers Guide chapter 5 - Electromagnetic waves

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Concepts covered in Class 12th Physics Volume 1 and 2 Answers Guide chapter 5 Electromagnetic waves are Electromagnetic Waves, Types of Spectrum Emission and Absorption Spectrumfraunhofer Lines.

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