For a rectangular wave, average current is ______ rms current.

Options

A. Greater than
B. Less than
C. Equal to
D. Not related

Explanation

Consider the diagram below,
Friction (f) is acting in the opposite direction of F.
Resultant force, `Ma=F-f…(i)`
where M is mass of the disc

The angular acceleration of the disc is
`alpha=(a)/(R)` (For pure rolling)
Now `tau=lalpha`
`therefore fR=((1)/(2)MR^(2))alpha`
`therefore fR=((1)/(2)MR^(2))((a)/(R))`
`therefore Ma=2f" "....(ii)`
From equ. (i) and (ii),
`2f=F-f`
`therefore 3f=F`
`therefore f=(F)/(3)[because N=Mg]`
Now, `flemuN=muMg`
`therefore (F)/(3)lemuMg`
`therefore Fle3muMg`
`therefore (because f=(F)/(3))`
`therefore F_(max)=3muMg`