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Ohm's law states that the current through a conductor between two points is directly proportional to the potential difference across the two points.
mathematically V=IR, where R is the resistance in conductor.

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Important point to be remembered:
hot water freezes in short time as compared to cold water. because heat transfer rate is high in hot water than cold water.

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Microphone is such a device which converts sound energy into electrical energy. While speaker is such a device which converts electrical energy into sound energy.

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Speed of sound in a material depends upon elasticity of the material (medium).for example sound will travel faster in iron than if it travel in air.

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First of Law of Thermodynamics: This law states that the total energy of an isolated system is constant, energy can be transformed from one form to another, but cannot be created or destroyed.

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important points:
1. photon has no mass and no charge.
2. mass of electron,proton and neutron in energy units is 0.511 MeV,938.3 MeV and 939.5 MeV.
3. electron and positron have about equal masses.

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Law of universal gravitation states that force of attraction between two objects is directly proportional to the product of their masses and inversly proportional to square of distance between them.

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Dear users kindly give us feed back at ([email protected]) or visit us at (http://www.smilesn.com/PhysicsSMS)
you can also post your questions or suggest topic(s) related to physics.
PhysicsSMS-Team

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A body will be in complete equilibrium if the sum of all the torque and forces acting on the body is equal to zero.

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