Explain the Electric dynamo ?

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which electronic devices used at low frequencies? and high frequencies?and microwave frequencies?

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i want to increase my ups back time ,i have added one 12v 68ah battery to my ups but it is not working ,is it possible to make adjustment so that new battery will work.

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Why are summer hotter than winters ?

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what is the relative speed between 2 serial electrons running in same direction along the wire?

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Define Bulk modulus ?

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what is the meltng point of copper?.

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How d o the radio-waves pass through walls ?

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i need the working and properties of the sextent and all the objects and much more about sextent..

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What is Relative humidity ?

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What is Myopic ?

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In any current connection there are two wires one is phase and another is neutral, what is the use of neutral wire?

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