# Electromagnetic Fields BTEE-403 4th Sem B.Tech PTU April 2019 Question Paper

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## Download Previous Year PTU University QuestionÂ Paper of Electromagnetic Fields 4th Sem B.Tech PTU April 2019 Question Paper

**B.Tech.** **(EE-2011 Batch)**

## Electromagnetic Fields

### Subject Code : BTEE-403Â Â Â Â Â Â Paper ID : [ A1206]

### Time : 3 Hrs.Â Â Â Â Â Â Â Â Â Â Â Â Â Max. Marks : 60

#### INSTRUCTIONS TO CANDIDATES :

1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks each.

2. SECTION-B contains FIVE questions carrying FIVE marks each and students have to attempt any FOUR questions.

3. SECTION-C contains THREE questions carrying TEN marks each and students have to attempt any TWO questions

## Electromagnetic Fields 4th Sem B.Tech PTU April 2019 Question Paper **SECTION-A**

**Q1. Write Briefly**

#### Â Â a) Define current density at a given point.

#### Â Â b) Write the expression for energy stored in magnetic field.

#### Â Â c) Define Electric Dipole.

#### Â Â d) State the condition for the vector F to be solenoidal.

#### Â Â e) Write down the magnetic boundary conditions.

#### Â Â f) What is Lorentz force?

#### Â Â g) Mention the properties of uniform plane wave.

#### Â Â h) What is the effect of permittivity on the force between two charges?

#### Â Â i) State Maxwellâ€™s third equation.

#### Â Â j) State Gauss law for magnetic field

## Â **Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â SECTION-B**

**Q2. Attempt any five questions.Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 5×6=30**

#### Â Â 2. Derive the expression for force on a moving charge in a magnetic field.

#### Â Â 3. Derive Poisson’s equation.

#### Â Â 4. Explain the importance of cylindrical and spherical coordinate systems with suitable example for study of electromagnetics.

#### Â Â 5. What is meant by skin depth of conductor? How it is related to attenuation constant? How does it depend upon conductivity and frequency?

#### Â Â 6. A 300Hz uniform plane wave propagates through fresh water for which s = 0, m_{r} = l, e_{r} = 7.8.Â Calculate : a) Attenuation constant.Â b) The phase constant.

**Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â SECTION-C**

**Q3. Attempt any three questions.****Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 3×10=30**

#### Â Â 7. Using Maxwell equations, derive the Poyntingâ€™s theorem.

#### Â Â 8. a) Derive the equation of continuity for time varying fields.

#### Â Â Â Â b) State and explain the electrostatic boundary conditions existing at the boundary between two dielectrics.

#### Â Â 9. Write short notes on the following :

#### Â Â Â a) Uniqueness Theorem

#### Â Â Â b) Reflection by perfect insulator at oblique incidence.

#### Current density at a given point.

#### Â

#### Expression for energy stored in magnetic field.

#### Â

#### Electric Dipole.

#### Â

#### Condition for the vector F to be solenoidal.

#### Â

#### magnetic boundary conditions.

#### Â

#### Lorentz force

#### Â

#### Properties of uniform plane wave.

#### Â

#### Effect of permittivity on the force between two charges

#### Â

#### Maxwellâ€™s third equation.

#### Â

#### Gauss law for magnetic field

##### Electrical Engg.Materials EE-208 4th Sem April 2019 B.Tech EE PaperÂ

#### Expression for force on a moving charge in a magnetic field.

#### Â Â

#### Poisson’s equation.

#### Â Â

#### Importance of cylindrical and spherical coordinate systems with suitable example for study of electromagnetics.

#### Â Â

#### Skin depth of conductor.how it depend upon conductivity and frequency?

#### Â Â Â

#### 300Hz uniform plane wave propagates through fresh water for which s = 0, m_{r} = l, e_{r} = 7.Calculate : a) Attenuation constant.Â b) The phase constant.

##### Electromagnetic Fields 4th Sem B.Tech PTU April 2019 Question PaperÂ

#### Maxwell equations,Derive the Poyntingâ€™s theorem.

#### Â

#### Equation of continuity for time varying fields.

#### Â

#### Explain the electrostatic boundary conditions existing at the boundary between two dielectrics.

#### Â

#### Short notes on the following :

#### a) Uniqueness Theorem

#### Â

#### b) Reflection by perfect insulator at oblique incidence.

##### Electromagnetic Fields 4th Sem B.Tech PTU April 2019 Question Paper

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