Explain qualitatively the phenomenon of quantum tunneling of an electron across a potential barrier? : quantum physics

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I just want to convert the voltage into current i.e. suppose I have 750V & 1A AC power then I want to convert it into 12V & 62A DC power only difficulty is that I don't want to use the tranceformer. Simply to say, I want to make the step-down without using tranceformer. Please, give me some ideas. And also I want the relation between Magnetic Induction & Weight of the body can be levitated. Or I can say, how much of magnetic induction requires to lift 500gms weight? I am heartily thankful to you.

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What is audio frequency?

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What is the Unit for charge?

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Why it is more difficult to stop a cricket ball than a tennis ball moving with same velocity ?

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Explain the Archimedes’s Principle ?

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Explain why are metals able to conduct current so well?

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Why is there a change in the weight of a body if the earth changes its speed ?

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Differentiate static and kinetic friction.

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How long does the light from sun take to reach us?

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why we use Transistor?

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What are the ten satellite launched from india and year of launch?

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