When the letters of an opposite side board are found in a mirror as reverse,why the same is not shown as up and down?

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Explain what is an electron?

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In general, alternating voltage varies between its maximum and minimum values 50 times per cycle. Why don't the circuit element show such fluctuation?

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Explain the Air Pressure Machines ?

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What are the three particles that make up an atom?

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egg or hen which came first

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Will the barometric height increase or decrease with the rise of temperature ?

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Explain what is an alloy?

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Explain the Types of Refrigeration ?

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while calculating KVA using Volt and Ampere Reading, why we multiply the result with Square Root of 3 (i.e, 1.73)?

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we know when two atom combine,the electrions are in valance band,but in case of semiconductor doner or acceptor level are above of v.. whyb

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1.when a diode has its maximum resistance? 2.is ohm's applicable for an ac circuit?  

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