Study the circuit carefully and answer
What can be placed between the open ends to light up the bulb ?
(i) Needle
(ii) Iron nail
(iii) Copper coin
(iv) Wooden piece
(A) (i) & (iii)
(B) (ii) & (iii)
(C) (i), (ii) & (iii)
(D) All of these.
What is this SOF? This is not expected from you all.