If two masses of 200 g and 300 g are attached to the 20 cm and 70 cm marks on a light metre rod respectively, then the M.I. of the system about an axis passing through 50 cm mark will be

Options

A. `0.15 kg m^(2)`
B. `0.03 kg m^(2)`
C. `0.3 kg m^(2)`
D. zero

Answer

B

Explanation

`I=m_(1)r_(1)^(2)+m_(2)r_(2)^(2)`
`= 0.2xx0.3^(2)+0.3xx0.2^(2)`
`= 0.03 kgm^(2)`