Differentiate between spermatogenesis and oogenesis in humans on the basis of the following:
(a) When the process is initiated.
Spermatogenesis: Begins at puberty.
Oogenesis: Begins during fetal development.
The alternating current \( I \) in an inductor is observed to vary with time \( t \) as shown in the graph for a cycle.
Which one of the following graphs is the correct representation of wave form of voltage \( V \) with time \( t \)?}