A) Do all bodies immersed in a given  fluid experience the same buoyant force ?Explain.
B) A 100cm cube block has a mass of 395gm find its relative density. (Density of water = 1gm/cm^{3 )}

Dear Student,

(A) The buoyant force on a body in a fluid depends upon the density of the fluid and the volume of the liquid displaced by the immersed body. So, clearly they will experience different buoyant forces as the different bodies displace different volumes.

(B)
$$\begin{gathered} Density of given subs\tan ce = \frac{mass}{volume}=\frac{395g}{100c{m}^3}=3.95g/c{m}^3 \\ so \\ Relative Density =\frac{Density of subs\tan ce }{Density of iron }=\frac{3.95gmc{m}^{-3}}{1gmc{m}^{-3}}=3.95 \end{gathered}$$
Regards