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Electronics and Communication Engineering :: Electromagnetic FielTheory

$ %Home> Electronics and &ommunication Engineering> Electromagnetic 'ield #(eory> Section 2

26.

If and

the time average Poynting vector is

30.

A dipole antenna of / length has an e!"ivalent total loss resistance of #.

efficiency of the antenna is

A) 0.'#$'( *) .'#$'(

&) '.#$'( +) '#.$'(

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Electromagnetic 'ield #(eory , -ection .

)

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If the electric field intensity is given *y + the potential difference

*et,een x-2+ 0+ 0 and y-#+ 2+ 3 is

A) # volt

*) # volt

&) $ volt

+) 6 volt

Ans!er / E0planation

Ans!er%1ption &

E0planation%

If the electric field intensity is given *y + the potential difference

*et,een x-2+ 0+ 0 and y-#+ 2+ 3 is

A) # volt

*) # volt

&) $ volt

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+) 6 volt

Ans!er / E0planation

Ans!er%1ption &

E0planation%

edi"m # has the electrical permittivity #4 #.$ 0farad/m and occ"pies the region to the left of x4

0 plane. edi"m 2 has the electrical permittivity 24 2.$ 0farad/m and the occ"pies the region to

the right of x4 0 plane. If 5#in medi"m # is volt/m+ then 52in medi"m 2 is

A)

*)

&)

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+)

Ans!er / E0planation

Ans!er%1ption &

E0planation%

According to *o"ndary condition

hence+ 5z#4 5z2

5y24 5y#

5t#4 5t2

Polariation of a ,ave is

A) direction of electric field

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*) direction of magnetic field at some fi7ed point in space

&) either -a or -*

+) none of the a*ove

Ans!er / E0planation

Ans!er%1ption A

E0planation%

8irection of electric field is to *e ta9en as reference.

&he sin"soidally time varying vector field

is

Ans!er / E0planation

Ans!er%1ption +

E0planation%

60: phase+ same magnit"de+ it form.

. 4 0 is fre!"ently 9no,n as

A) contin"ity e!"ation for steady c"rrents

*) ;aplace e!"ation

&) Poisson

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Ans!er%1ption A

E0planation%

5!"ation of contin"ity

7 = 4 0.

#0.

&he magnetic field intensity vector of a plane ,ave is given *y -x+ y+ z+ t 4 #0 sin -$000t

0.00x 30 + ,here denotes "nit vector in ydirection the ,ave is propagating ,ith a

phase velocity.

A) $ 7 #0m/sec

*) 3 7 #0m/sec

&) #.2$ 7 #0?m/sec

+) 3 7 #0m/sec

Ans!er / E0planation

Ans!er%1ption &

E0planation%

-x+ y+ z+ t 4 #0 sin -$000t 0.00x 30

@ave is propagating in ve direction+ hence

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v4 #.2$ 7 #0?m/sec.

If the electric field intensity associated ,ith a "niform plane electromagnetic ,ave travelling in a

perfect dielectric medi"m is given *y

5-z+ t 4 #0 cos -27 #0?t 0.# z volt/metre+ then the velocity of the travelling ,ave is

A) 3.0 7 #0m/sec

*) 2 7 #0m/sec

&) 6.2 7 #0?m/sec

+) 2 7 #0?m/sec

Ans!er / E0planation

Ans!er%1ption *

E0planation%

5-z+ t 4 #0 cos -27 #0?t 0.# z

f 4 #0? + B 4 0.#

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