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What is Radiation pattern of have wave dipole is?
In open space, infinitely far from material objects, the radiation pattern of a half-wave dipole is a torus (donut), with the radiator (wire) passing straight through the center of the hole. The field strength is maximum in all directions perpendicular to the wire, and zero in the directions off the ends of the wire. The peak field strength is +2.2 dB relative to isotropic.
What is the expression for the electric field in the perpendicular bisector plane of a dipole?
In the perpendicular bisector plane of a dipole, the electric field expression is given by: E = (kqd)/(r^3), where E is the electric field, k is Coulomb's constant, q is the magnitude of the charge at each end of the dipole, d is the separation distance between the charges, and r is the distance from the midpoint of the dipole.
What is the radiation resistance of a half-wave folded dipole?
The radiation resistance of a half-wave folded dipole is typically around 300 ohms. This value is higher compared to a regular half-wave dipole due to the increased current distribution along the folded elements.
Radiation resistance of folded dipole?
The radiation resistance of a folded dipole antenna is typically higher than that of a simple dipole antenna, approximately 300 ohms compared to 73 ohms. This increase in radiation resistance helps improve the efficiency and performance of the antenna. The folded design allows for a more compact structure while maintaining good radiation characteristics.
What is the value of radiation resistance of half wavelength dipole antenna?
36 ohm
When is the torque on an electric dipole in an electric field is maximum?
The torque on an electric dipole in an electric field is maximum when the dipole is aligned parallel or anti-parallel to the electric field lines. This occurs because the torque is given by the cross product of the electric dipole moment vector and the electric field vector, and it is maximum when the angle between them is 90 degrees.
How does a rotating dipole radiation affect the electromagnetic field around it?
A rotating dipole radiation causes the electromagnetic field around it to change direction and strength periodically. This results in the emission of electromagnetic waves in all directions, similar to a spinning top creating ripples in water.
What is a infrared active gas?
Absorption of energy from IR radiation can only occur when the wavelength of radiation and the wavelength of the bond vibration match. If a molecule has symmetry...for example no dipole, we say it is IR inactive. CO2 has no dipole....this would be an IR inactive gas...Cl2 as well. A gas that has a dipole would be IR active. Propene would be a nice example of an IR active gas.It possesses a dipole. One would see a signal around 1650.A:CO2 has no permanent dipole. However, when CO2 undergoes a bending vibration, its dipole moment changes from zero to some non-zero value. This vibration produces a change in dipole moment and is therefore IR active.
What is a active gas?
Absorption of energy from IR radiation can only occur when the wavelength of radiation and the wavelength of the bond vibration match. If a molecule has symmetry...for example no dipole, we say it is IR inactive. CO2 has no dipole....this would be an IR inactive gas...Cl2 as well. A gas that has a dipole would be IR active. Propene would be a nice example of an IR active gas.It possesses a dipole. One would see a signal around 1650.A:CO2 has no permanent dipole. However, when CO2 undergoes a bending vibration, its dipole moment changes from zero to some non-zero value. This vibration produces a change in dipole moment and is therefore IR active.
Why counterpoise is used in dvor?
Counterpoise is used in a dipole vertical antenna to improve its performance by providing a balanced electrical path for the antenna. This helps to reduce common-mode currents and improve the antenna's efficiency in transmitting and receiving signals. By using a counterpoise, the dipole antenna can achieve a better radiation pattern and impedance matching.
You turn an electric dipole end for end in a uniform electric field.How does the work you do depend on the initial orientation of the dipole with respect to the field?
The work done by you to turn the electric dipole end for end in a uniform electric field depends on the initial orientation of the dipole with respect to the field. If the dipole is initially oriented such that its positive and negative charges are parallel to the electric field, then no net work is done as the electric field does not do any work on the dipole as the electric field lines do not transfer any energy. On the other hand, if the dipole is initially oriented such that its positive and negative charges are perpendicular to the electric field, then work is done by you to turn the dipole as the electric field exerts a force on the charges in the dipole in opposite directions, causing them to move in opposite directions. As a result, you have to do work to move the charges and turn the dipole.
How electric field is equal to force by dipole moment?
The electric field produced by a dipole at a distance is given by the formula E = 2kP/r^3, where k is the electrostatic constant, P is the dipole moment, and r is the distance from the dipole. This electric field exerts a force on a test charge q placed in the field, given by F = qE. Therefore, the force on a charge due to a dipole moment is directly proportional to the dipole moment and the charge, according to these equations.
