EMT Solved Semester Question Paper 2019 May (2017 Reg)

MAY - 2019

Electromagnetic Theory (80130)

Solved Paper

Sem - III [EEE]

Regulation 2017

Time : Three Hours]                [15]

[Maximum Marks : 100

 

PART A - (10 × 2 = 20 Marks)

Q.1 State the condition for the vector F to be solenoidal. (Refer Two Marks Q.31 of Chapter - 1)

Q.2    What are the sources of electric field and magnetic field ? (Refer Two Marks Q.5 of Chapter - 1)

Q.3    Why water has much greater dielectric constant than mica ? (Refer Two Marks Q.41 of Chapter - 5)

Q.4 What are the significant physical differences between Poisson's and Laplace's equations ?

(Refer Two Marks Q.3 of Chapter - 6)

Q.5 State Gauss law for magnetic field. (Refer Two Marks Q.14 of Chapter - 7)

Q.6 State the conservative property of electric field. (Refer Two Marks Q.8 of Chapter - 4)

Q.7 What is the effect of permittivity on the force between two charges ?

(Refer Two Marks Q.26 of Chapter - 2)

Q.8 What is main effect of eddy current ? (Refer Two Marks Q.40 of Chapter - 8)

Q.9 Mention the properties of uniform plane wave. (Refer Two Marks Q.64 of Chapter - 10)

Q.10 Define Poynting vector. (Refer Two Marks Q.46 of Chapter - 10)

 

PART B - (5 x 13 = 65 Marks)

Q.11 a)

OR

b) A charge of 1C is at (2, 0, 0). What charge must be placed at (- 2, 0, 0) which will make y component of total   zero at the point (1, 2, 2) ? (Refer example 2.3.6)

Q.12 a) Consider an infinite line charge with density p L dm, along z-axis. Obtain the work done if a point charge Q is moved from r = a to t = b along a radial path. (Refer example 4.3.4)

OR

b) V = x -y + xy+zV, find   at (1, 2, 3) and the electrostatic energy stored in a cube of side 2 m centered at the origin.

(Reter example 4.13.2)

Q.13 a) A 'z' directed current distribution is given by,  at any point r > a using Ampere's circuital law.

(Refer example 7.9.3) 

OR

b) A circular loop of radius r and current 1 lies in z = 0 plane. Find the torque which results if the current is in 

Q.14 a) A conducting cylinder of radius 7 cm and height 50 cm rotates at 600 rpm in a radial field . Sliding contacts at the top and bottom are used to connect a voltmeter as shown in the Fig.l. Calculate induced voltage.

(Refer example 9.2.5)

OR

b) A parallel plate capacitor with plate area of 5 cm² and plate separation of 3 mm has voltage 50 sin 103t V applied to its plates. Calculate displacement current assuming Ɛ = 2 Ɛ0.

(Refer example 9.3.9)

Q.15 a) Explain in detail the behavior of plane waves in lossless medium. (Refer section 10.5)

OR

b) Starting from Maxwells equations derive the expression for Poynting vector and explain its significance.

(Refer section 10.8)

 

PART C - (1 x 15 = 15 Marks)

Q.16 a) Find the capacitance of conducting sphere of 2 cm in diameter, covered with a layer of polyethelene with Ɛr = 2.26 and 3 cm thick. (Refer example 5.15.1)

OR

b) The region between two concentric right circular cylinders contains a uniform charge density p. Solve the Poisson's equation for the potential in the region. (Refer example 6.4.1)