A) the surfaces of the discs are made of iron with aluminium inside
B) the whole of aluminium is kept in the core and the iron at the outer rim of the disc
C) the whole of the iron is kept in the core and the aluminium at the outer rim of the disc
D) the whole disc is made with thin alternate sheets of iron and aluminium
Correct Answer: B
Solution :
We know density of iron > density of aluminium Moment of inertia \[I=I=\int_{{}}^{{}}{{{r}^{2}}\,dm.}\] \[\therefore \]Since, \[{{\rho }_{iron}}>{{\rho }_{alu\min ium}}\] Hence to get high a moment of inertia whole of aluminium is kept in the core and the iron at the outer rim of the disc.You need to login to perform this action.
You will be redirected in
3 sec