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]

#### Chapters ## 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.

## Chapter 5: Electromagnetic waves

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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