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elasticity is defined as the ability of a solid to return to its original shape even after being expanded or contracted. elasticity is termed as the
the substances which acquire charges on rubbing are said to be charged. the electricity produced by friction is called frictional force. if the
electrostatics ndash two kinds of charges introductionif a glass rod is rubbed with silk cloth it acquires a positive charge while silk
if the charges are situated in a medium of permittivity epsilon then the magnitude of the force between them will be if the charges are situated
introduction and definitionthe force between two particles was studied by coulomb in 1785. he stated that the force of attraction or
nichrome nichrome is an alloy of manganese 1.5 nickel 75 to 78 chromium 20 to 23 and a little percentage of iron.properties1. its
constantan constantan is a copper-nickel alloy. the amount of nickel in constantan is 40.properties1. it is silver like
the lead alloy most of the soldering in the electronic industry is carried out using tin lead alloy. pure lead metals at 3270c whereas tin melts at
tinatomic number50symbolsnatomic weight118.69discoveryknown since ancient timeelectronic configurationkr5s24d105p2word originanglo-saxon tin latin
leadatomic number82symbolpbatomic weight207.2discoveryknown since prehistoric timeelectronic configuration6p2properties 1. it is
platinumatomic number78symbolptatomic weight195.09discoveryolloa 1735electronic configuration5d9melting point17750celectrical resistivity10.910-8
mercury atomic number80symbolhgatomic weight200.59discoveryknown to the ancient hindus and chinese. mercury has
tungstenatomic number74symbolwatomic weight183.85discoverypurified tungsten in 1783.electronic configurationxe 6s2 4f14 5d4word originswedish
carbonatomic number6symbolcatomic weight12.011discoverycarbon exists free in nature and has been known since prehistoric time.electronic
acsr aluminium conductor steel reinforcedowing to the low tensile strength of aluminium aluminium conductors produce greater sag which prohibits
aac all aluminium standard conductorsstandard conductors are the conductors made of thin wires of small cross-section and bunched together. they are
steel steel contains iron with a small percentage of carbon added it. iron itself is not very strong but the additions of small percentage of carbon
beryllium copper alloy it is obtained by alloying copper and beryllium. these alloys containing beryllium up to 2.75 can be produced in the form of
bronze copper when alloyed with tin 8 to 16 and a very small percentage of a third element like cadmium beryllium phosphorous silicon etc is called
brass when copper is alloyed zinc 60 copper 40 zinc is called brass. it is widely used as a current carrying and structural material in switches and
gold atomic number79symbolauatomic weight196.9665discoveryknown since prehistoric
silver symbol agatomic weight107.868 atomic number 47discoveryknown since prehistoric time. man learned to separate silver from
aluminium atomic number13symbolalatomic weight26.98154discoverywohler 1827electronic configurationne 3pword originlatin alumen alum an astringent
copper atomic number29symbolcuatomic weight63.546discoverycu has been known since prehistoric time. it has been mined for more than 5000
high resistive materialsthe materials which have their resistivity 10-8 to 10-6 ohm-m come under this category. these materials are used for making