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Electronics and Communication Engineering - Electromagnetic Field Theory

Exercise : Electromagnetic Field Theory - Section 1
36.
The torque (in mm) acting on a circular current loop of radius 1 mm in the xy plane, connected at the origin and with current 0.1 A, flowing in the sense of increasing in a magnetic field
is
10-12p
- 10-12p
Answer: Option
Explanation:

t = M x B

37.
Which one of the following potential does not satisfy Laplace's equations?
v = 10 xy
v = p cos φ
v = f cos φ + 10
Answer: Option
Explanation:

.

38.
A rectangular waveguide measures 3 x 4.5 cm internally and has a 10 GHz signal propagated in it. Calculate the wave impedance for dominant mode.
130 p
1.3 p
120 p
12 p
Answer: Option
Explanation:

Wave impedance

.

39.
Calculate wave impedance for TE mode
(377)Ω
226 Ω
∞
629 Ω
Answer: Option
Explanation:

.

40.
In a 100 turn coil, if the flux through each turn is (t3 - 2t)mWb, the magnitude of the induced emf in the coil at a time of 4 sec is
46 mV
56 mV
4.6 V
5.6 V
Answer: Option
Explanation:

E = 100 (3t2 - 2) 100(46) 4600 mV

4.6 V.

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