Join 60,000+ competitive exam aspirants
or with email
Your Cart
SubtotalтВ╣0
TotalтВ╣0
Examoogle тАв User тАв info@examoogle.com тАв EE-2024-8821
Chapter 1 of 12 тАв Page 1 of 248ЁЯФТ Protected PDF тАв Watermarked
Join 60,000+ competitive exam aspirants
Skin effect happened due to
Voltage
Capacitance
Line inductance
All of the above
Line inductance
The skin effect is the tendency of an alternating current (AC) to distribute itself such that the current density is highest near the surface of the conductor and decreases towards the center. This phenomenon is primarily caused by internal flux linkages within the conductor, which induce eddy currents that oppose the current flow in the center.
The skin effect is the tendency of an alternating current (AC) to distribute itself such that the current density is highest near the surface of the conductor and decreases towards the center. This phenomenon is primarily caused by internal flux linkages within the conductor, which induce eddy currents that oppose the current flow in the center.
RacтАЛ>RdcтАЛ тАФ effective resistance increases with frequency
LintтАЛ=8╧А╬╝0тАЛтАЛ тАФ internal inductance per unit length causing the effect
When an AC flows through a conductor, it generates magnetic flux lines, both inside and outside the conductor. The flux linkages are higher at the center of the conductor compared to the surface, resulting in higher self-inductance at the core. This increased inductive reactance at the center forces the current to prefer the path of least impedance, which is the outer skin, thereby increasing the effective resistance of the conductor.
Skin effect increases with the square root of frequency.
It is more pronounced in larger diameter conductors.
Higher magnetic permeability of the conductor material increases the skin effect.
Direct current (DC) does not experience skin effect as the internal flux is constant.
Useful in high-frequency applications like RF shielding.
Limits fault current magnitude in specific high-frequency scenarios.
Increases power loss due to higher effective AC resistance.
Reduces the effective cross-sectional area of the conductor, leading to poor material utilization.
Transmission line design (use of ACSR conductors to minimize effect).
High-frequency radio transmission.
Option A (Voltage) does not cause skin effect; it is a frequency-dependent phenomenon.
Option B (Capacitance) is a shunt parameter and is unrelated to the internal flux linkage mechanism causing skin effect.
The skin effect is quantified by the 'skin depth' parameter, denoted by ╬┤.
C is correct тАФ Skin effect occurs due to the non-uniform distribution of current caused by higher internal inductance at the center of the conductor compared to its surface.
Always remember that skin effect depends on frequency (f), diameter (d), and magnetic permeability (╬╝), but it is independent of voltage level.