Answer
The black or shorter curve is $ y=cos x$,
The red or longer curve is $y= cos \frac{x}{2}$.
So it is evident that with increase in B, the cycle becomes shorter.
Work Step by Step
The black or shorter curve is $ y=cos x$,
The red or longer curve is $y= cos \frac{x}{2}$.
So it is evident that with increase in B, the cycle becomes shorter.
