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Consider the following types of transmission lines:
- Open-wire line
- Twin-lead wire
- Coaxial cable
The capacitance per metre will be least in which of the above transmission lines?
- a)1 only
- b)2 only
- c)3 only
- d)1, 2 and 3
Correct answer is option 'A'. Can you explain this answer?
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Most Upvoted Answer
Consider the following types of transmission lines: Open-wire line Twi...
The capacitance per meter is least in an open-wire line compared to twin-lead wire and coaxial cable.
1. Open-wire Line:
An open-wire line consists of two conductors separated by air or a dielectric material. The conductors are usually parallel and can be made of metal wires or rods. The capacitance between the conductors is due to the proximity of the electric field lines. The capacitance per meter in an open-wire line is relatively low because the electric field is mostly concentrated in the space between the conductors and in the surrounding air.
2. Twin-lead Wire:
Twin-lead wire is a type of transmission line that consists of two parallel conductors separated by a dielectric material. The capacitance between the conductors is higher compared to an open-wire line because the dielectric material increases the electric field between the conductors, resulting in higher capacitance. The dielectric material can be made of plastic, rubber, or other insulating materials.
3. Coaxial Cable:
A coaxial cable consists of a central conductor surrounded by a dielectric material, which is further surrounded by an outer conductor or shield. The capacitance per meter in a coaxial cable is higher compared to an open-wire line and twin-lead wire. The dielectric material between the central conductor and the outer shield increases the electric field, resulting in higher capacitance.
In summary, the capacitance per meter is least in an open-wire line compared to twin-lead wire and coaxial cable. This is because in an open-wire line, the electric field is mostly concentrated in the space between the conductors and in the surrounding air, resulting in lower capacitance. In contrast, the presence of a dielectric material in twin-lead wire and coaxial cable increases the electric field and, therefore, the capacitance.
1. Open-wire Line:
An open-wire line consists of two conductors separated by air or a dielectric material. The conductors are usually parallel and can be made of metal wires or rods. The capacitance between the conductors is due to the proximity of the electric field lines. The capacitance per meter in an open-wire line is relatively low because the electric field is mostly concentrated in the space between the conductors and in the surrounding air.
2. Twin-lead Wire:
Twin-lead wire is a type of transmission line that consists of two parallel conductors separated by a dielectric material. The capacitance between the conductors is higher compared to an open-wire line because the dielectric material increases the electric field between the conductors, resulting in higher capacitance. The dielectric material can be made of plastic, rubber, or other insulating materials.
3. Coaxial Cable:
A coaxial cable consists of a central conductor surrounded by a dielectric material, which is further surrounded by an outer conductor or shield. The capacitance per meter in a coaxial cable is higher compared to an open-wire line and twin-lead wire. The dielectric material between the central conductor and the outer shield increases the electric field, resulting in higher capacitance.
In summary, the capacitance per meter is least in an open-wire line compared to twin-lead wire and coaxial cable. This is because in an open-wire line, the electric field is mostly concentrated in the space between the conductors and in the surrounding air, resulting in lower capacitance. In contrast, the presence of a dielectric material in twin-lead wire and coaxial cable increases the electric field and, therefore, the capacitance.
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Community Answer
Consider the following types of transmission lines: Open-wire line Twi...
Open-wire line:
The capacitance of an open-wire line is given by,
Where r is the radius of the conductor
d is the distance between the lines
Twin-lead wire:
The capacitance of a twin-lead wire is given by,
Where r is the radius of the conductor
D is the distance between the conductors
Coaxial cable:
The capacitance of a co-axial cable is given by,
Where b is the radius of the outer conductor
a is the radius of the inner conductor
The capacitance of an open-wire line is given by,
Where r is the radius of the conductor
d is the distance between the lines
Twin-lead wire:
The capacitance of a twin-lead wire is given by,
Where r is the radius of the conductor
D is the distance between the conductors
Coaxial cable:
The capacitance of a co-axial cable is given by,
Where b is the radius of the outer conductor
a is the radius of the inner conductor
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Consider the following types of transmission lines: Open-wire line Twin-lead wire Coaxial cableThe capacitance per metre will be least in which of the above transmission lines?a)1 onlyb)2 onlyc)3 onlyd)1, 2 and 3Correct answer is option 'A'. Can you explain this answer?
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