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Author Archives: admin

what is Difference between induced emf and induced current?

There are many ways to produced induced emf figure illustrated one of them. Consider a straight piece of wire of length l placed in the magnetic field of a permanent magnet. The wire is connected to a sensitive galvanometer. This forms a closed path or loop without any battery. In beginning when the loop  is at rest in the magnetic ...

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difference between centre of mass and centre of gravity

Centre of mass of a system is such a point where an applied force causes the system to move without rotation.And The centre of gravity of a body is the point where the whole weight of the body appears to act vertically downward. Centre of Mass “Centre of mass of a system is such a point where an applied force causes ...

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Binding Energy and mass defect

Physically, we define the binding energy as the positive work necessary to dissemble a nucleus into its constituents (nucleons). Equivalently  it is the energy liberated when Z proton and N neutrons combine to form a nucleus. For visualization, consider the simplest example of the deutron disintegration. The deutron atom H12 has a mass of 1.014102 a.m.u while the mass of the hydrogen ...

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Cosmic rays : Definition,uses and effects

The rays which receive on earth from outer space are called cosmic rays.It has been found that extremely penetrating radiations consisting of charged and uncharged particles and photons are reaching the earth. These radiations are called Cosmic Radiations. The sources of these radiations lie beyond the sun or the other stars of our galaxy. The radiations reaching the top of ...

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State the Pauli Exclusion Principle

According to Pauli Exclusion Principle no two electrons can have samples values of the quantum numbers n, l,ml and ms or they can not have all these quantum numbers similar; at least one of the four numbers which are strictly required to Specify the state of an electron should be different from the quantum numbers which specify the state of an other electron ...

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Thermal conductivity:Definition,formula,examples and applications

“The rate of flow of heat across the opposite faces of a meter cube of a substance maintained at a temperature difference of one kelvin is called thermal conductivity of that substance.” Thermal conductivity equation Conduction of heat occurs at different rates in different materials.In metals, heat flows rapidly as compared to insulators such as wood or rubber.Consider a solid ...

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What happens when two waves interfere?

Interference is the process of superposition of two waves having same wavelength ,amplitude and frequency.When the waves interfere,there is no loss of energy.During constructive interference ,the two waves are added up to give a resultant wave of large amplitude.During destructive interference ,the two waves having same wavelength and amplitude arrive out of phase and cancel each other’s effect.At the point ...

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Difference between plane wave and spherical wave with examples

Plane waves In a plane wave disturbances travel in single direction. Plane waves examples For example when a string is fixed at both ends and the string is plucked at one end ,then transverse waves are generated in the string in which particles of the medium vibrate in one direction.So the transverse waves are plane waves.It is not possible in ...

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uses of damping devices in machinery

The damping devices are often used on machinery to increase the damping and reduce the vibrational effects caused due to running of machinery.These vibrational effects disturb the whole assembly and the building in which the machinery is working.The vibrational frequency of the machinery may cause the vibrations of large amplitude.To avoid this disturbance ,the damping devices are often used on ...

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Difference and relationship between stress and strain

Stress It is defined as the force applied on unit area to produce change in the shape,volume or length of a body.Mathematically it is expressed as: The SI unit of stress (σ) is newton per square meter (Nm-2),which is given the name pascal  (pa). Stress may cause a change in length,volume and shape. Tensile stress When a stress  changes the ...

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