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Yogita Ingle 5 years, 11 months ago
The Seebeck effect is a phenomenon in which a temperature difference between two dissimilar electrical conductors or semiconductors produces a voltage difference between the two substances.
Posted by Rahul Roushan 5 years, 11 months ago
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Posted by Rahul Roushan 5 years, 11 months ago
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Yogita Ingle 5 years, 11 months ago
i) Larger the separation between the electrodes of the cell, more the length of the electrolyte through which current has to flow and consequently a higher value of internal resistance
ii) Greater the conductivity of the electrolyte, lesser is the internal resistance of the cell. i.e. internal resistance depends on the nature of the electrolyte.
iii) The internal resistance of a cell is inversely proportional to the common area of the electrodes dipping in the electrolyte.
iv) The internal resistance of a cell depends on the nature of the electrodes.RE rI IE = V + v= IR + Ir= I (R + r) I = E / (R + r) This relation is called circuit equation. V
Posted by Rahul Roushan 5 years, 11 months ago
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Posted by Rahul Roushan 5 years, 11 months ago
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Yogita Ingle 5 years, 11 months ago
The amount of electric current travelling per unit cross-section area is called as current density and expressed in amperes per square meter. More the current in a conductor, higher will be the current density. However, the current density alters in different parts of an electrical conductor and the effect takes place with alternating currents at higher frequencies.
Electric current always creates a magnetic field. Stronger the current, more intense is the magnetic field. Varying AC or DC creates an electromagnetic field and this is the principle based on which signal propagation takes place.
The formula for Current Density is given as,
J = I / A
Where,
I = current flowing through the conductor in Amperes
A = cross sectional area in m2.
Current density is expressed in A/m2.
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Yogita Ingle 5 years, 11 months ago
Shorter wavelength and high frequency scatter more due to the waviness of the line and its intersection with a particle. The wavier the line, more are the chances of it intersecting with a particle. On the other hand, longer wavelength have low frequency and they are straighter and chances of colliding with the particle is less so the chances are less.
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Yogita Ingle 5 years, 11 months ago
The electric dipole moment is a vector quantity; it has a defined direction which is from the negative charge to the positive charge. Though, it is important to remember that this convention of direction is only followed in Physics. In Chemistry, the convention is taken to be opposite i.e. from positive to negative. The line along the direction of an electric dipole is called the axis of the dipole.
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Vaikundam Janaki 5 years, 11 months ago
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