Just a shot in the dark here on the first question.
Copper is cheaper than Silver.
(thats the same reason that they nickel plate quarters that are made of mostly copper . . . copper is cheap)
Answer the followings:
i.Silver is the best conductor than copper, then why Copper wires are generally used in daily life instead of silver wires?
ii.What will be the frequency of 3v DC battery?
iii.In which circuit analysis techniques KCL and KVL are used.
steel, while the silver coinage is still made of a nickel alloy!
(the intrinsic value of the older copper coins exceeded their face value
so you were better off selling them for scrap than spending them)