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A wooden block, with a coin placed on it...

A wooden block, with a coin placed on its top, floats in water as shown in figure. The distance l and h are shown here. After some time the coin falls into water. Then

A

l decreases

B

h decreases

C

l increases

D

h increases

Text Solution

Verified by Experts

The correct Answer is:
A, B
When the coin falls into the water, weight of the (block + coin) system decreases, which was balanced by the upthrust force earlier. As weight of the system decreases, hence upthrust force will also decrease which is only possible when l decreases.
As l decreases volume of water displaced by the block decreases, hence h decreases.
Note As the coin falls into water, it displaces some volume of water which is very less hence, we neglect volume of the coin.
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