Comments on the electromagnetic fields of a time-dependent solenoid

1987 ◽  
Vol 20 (16) ◽  
pp. 5729-5731 ◽  
Author(s):  
E Comay
Keyword(s):  
Electromagnetic Fields ◽  
Time Dependent

On: “Time‐Dependent Electromagnetic Fields of an Infinite, Conducting Cylinder Excited by a Long Current‐Carrying Cable” by S. K. Verma (GEOPHYSICS, April 1973, p. 369–379)

Geophysics ◽  
1974 ◽  
Vol 39 (3) ◽  
pp. 355-355
Author(s):  
Shri Krishna Singh
Keyword(s):  
Magnetic Field ◽  
Frequency Domain ◽  
Electric Current ◽  
Electromagnetic Fields ◽  
Time Domain ◽  
Static Solution ◽  
Transverse Magnetic ◽  
Time Dependent ◽  
Axially Symmetric ◽  
The Time Domain

In this paper Verma obtains a time‐domain solution by inverting the frequency‐domain solution given by Wait (1952). However, it has been recently pointed out by Singh (1973a) (see also Wait, 1973) that there is an error in the quasi‐static solution of Wait. Wait neglected the axially symmetric inducted electric current in the cylinder giving rise to a secondary transverse magnetic field outside (the n=0 term in the scattered wavefield). Singh (1973a) has shown that this term dominates. [It should be noted that Wait in his other works on the cylinder retains this term (e.g., Wait, 1959).] It is clear that this term would be dominant in the time‐domain also. This has been shown by Singh (1972, 1973b). Since the theoretical solution given by Verma in the paper under discussion is incomplete, his interpretation schemes are meaningless.

Exact Solution to Landau System with Time-Dependent Electromagnetic Fields

1999 ◽  
Vol 16 (6) ◽  
pp. 391-393 ◽  
Author(s):  
Zu-jian Ying ◽  
Shun-jin Wang ◽  
Wen-zhong Zhang
Keyword(s):  
Exact Solution ◽  
Electromagnetic Fields ◽  
Time Dependent
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