Two sinusoidal voltage of the same frequency are shown in the diagram. What is the frequency, and the phase relationship between the voltage?

Frequency in `Hz` phase lead of `N` over `M` in radius

Options

A. `0.4 =-pi//4`
B. `2.5 =-pi//2`
C. `2.5 =+pi//2`
D. `2.5 =-pi//2`

Answer

B

Explanation

From the graph shown below. It is clear that phase lead of `N` over `M` is `-(pi)/2`. Since time periode (i.e., taken to complete one cycle)`=0.4sec`. Hence frequency `V=1/T=2.5 Hz`