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Semi conductors:
Semi conductors are these substances which lie among conductor and insulators.
Semi conductor is those substances which hardly pass electric current by them.
E.g. crystals of silicon and germanium.
Some wire of cross-sectional area 1mm 2 has a resistance of 20 ?. Determine (a) the resistance of a wire of the same length and material if the cross-sectional area is 4mm 2 ,
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what are uncontrollable fission chain reactions complete detail
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