There are the rise and fall of the sea level because of the gravitational force exerted by the sun, moon and the rotation of the earth.
Tidal force effect the whole earth, the movement of the earth by mere meter, change in atmosphere as it mostly consists of fluid the movement of fluid takes place in kilometers.
Hence, we can say that tidal bulges have a wavelength in order of thousands of kilometers.
From A to B its 5 ohm. above shown 6 and 12 ohm resistors are in parallel to short circuit hence their equivalent resistance is zero. (Current doesnt flow through a resisstor if there is a Short circuit alternate.