The Depth of penetration of EM wave in medium having conductivity ? at a frequen

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Question
The Depth of penetration of EM wave in medium having conductivity ? at a frequency of 1 MHz is 25 cm. The depth of penetration at a frequency of 4 MHz will be
Options
A. 6.25 cm
B. 12.50 cm
C. 50 cm
D. 100 cm

Correct Answer

12.50 cm

Explanation

Skin depth

The Depth of penetration of EM wave in medium having conductivity ? at a frequency of 1 MHz is 25 cm

The Depth of penetration of EM wave in medium having conductivity ? at a frequency of 1 MHz is 25 cm

⟹ ?₂ = ?₁/2 .

More questions

1. The power requirements of a DRAM in active and stand by modes is about
Options
A. 350 mW and 5 mW respectively
B. 350 mW each
C. 5 mW each
D. 350 mW and 100 mW respectively

2. The different access methods which permit many satellite users to operate in parallel through a single transponder without interfering with each other as
Options
A. Frequency Division Multiple Access (FDMA)
B. Time Division Multiple Access (TDMA)
C. Code Division Multiple Access (CDMA)
D. All of the above

3. Match the following:

	List I		List II
A.	T (Reflection coefficient) = 0	1.	(Z_L - Z_o)/(Z_L + Z_o)
B.	T = - 1	2.	Z_L = Z_o
C.	T = + 1	3.	Z_L = 0
D.	- 1 < T < + 1	4.	Z_L = ?

Options
A. A-2, B-3, C-4, D-1
B. A-2, B-4, C-1, D-3
C. A-1, B-2, C-3, D-4
D. A-3, B-2, C-4, D-1

4. Assertion (A): Ferromagnetic materials possess ferromagnetic properties only when temperature is less than paramagnetic curie temperature.
Reason (R): For a ferromagnetic material for T > ?_f.
Options
A. Both A and R are true and R is correct explanation of A
B. Both A and R are true but R is not correct explanation of A
C. A is true but R is false
D. A is false but R is true

6. A two branch parallel circuit has a 20 ? resistance and 1 H inductance in one branch and a 100 ?F capacitor in the second branch. It is fed from 100 V ac supply, at resonance, the input impedance of the circuit is
Options
A. 500 ?
B. 50 ?
C. 20 ?
D. 5 ?

8. An amplifier has a large ac input signal. The clipping occurs on both the peaks. The output voltage will be nearly a
Options
A. sine wave
B. square wave
C. triangular wave
D. (a) or (c)

9. In the figure shown, A₁, A₂, A₃ are identical Ammeters. If A₁ and A₃ read 5 and 13 A respectively, reading of A₂ will be
Options
A. 8
B. 13 A
C. 18
D. 12 A

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