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A block of aluminium of mass 1 kg and vo...

A block of aluminium of mass `1 kg` and volume `3.6 xx 10^-4 m^3` is suspended from a string and then completely immersed in a container of water. The decrease in tension in the string after immersion is.

A

9.8 N

B

6.2 N

C

3.6 N

D

1.0 N

Text Solution

Verified by Experts

The correct Answer is:
C
In air, T = mg
In water, T.= `mg-v rho_w g`
`Delta T=T-T.`
`= m g - (m g-v rho_w g)`
`= v rho g`
`= (3.6xx10^(-4)) (10^3) (10)` = 3.6 N.
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