Q.
The spring balance $A$ reads 2 kg with a block of mass $m$ suspended from it. A balance $B$ reads 5 kg when a beaker with liquid is put on the pan of the balance. The two balances are now so arranged that the hanging mass is inside the liquid in a beaker as shown in figure
A) The balance $A$ will read more than 2 kg
B) The balance $B$ will read less than 5 kg
C) The balance $A$ will read less than 2 kg and $B$ will read more than 5 kg
D) The balance $A$ will read more than 2 kg and $B$ will read less than 5 kg
Explanation
(c) The effective weight of the block in liquid will become less than 2 kg due to buoyancy of liquid. As a result of which $A$ will read less than 2 kg
As the body immersed in liquid has some effective weight acting downwards so the reading of $B$ will be more than 5 kg
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.