6.Both the number of turns and the core length of an inductive coil are doubled. Its self-inductance will be

7.If current in a conductor increases then according to Lenz's law self-induced voltage will

8.The law that the induced e.m.f. and current always oppose the cause producing them is due to

9.Air-core coils are practically free from

10.Which of the following circuit element stores energy in the electromagnetic field ?