Electric current in the flow of
Answer : B. free electrons
An example of semi-conductor is
Answer : B. Germanium
which of the following can be made into a permanent magnet?
Answer : B. hard steel
Which metal is commonly used for making an electromagnet?
Answer : B. Iron
On adding a little antimony to germanium,we get
Answer : B. n-type semiconductor
The magnetic effect of elctric current was first observed by
Answer : B. Oersted