The most Accurate Balance:

The mass of a one-rupee coin is done using different balances as given below:

(a) Beam Balance:

Let the balance measures the coin's mass = 3.29 A sensitive beam balance may be able to detect a change as small as 0.1 g or 100 mg.

(b) Physical Balance:

Let the balance measure the coin's mass = 3.24 g

The least count of the physical balance may be as small as 0.01 g of 10 mg. Therefore, its measurement would be more precise than a sensitive beam -balance.

(c) Electronic Balance:

Let the balance measure the coin's mass = 3.247 g Least count of an electronic balance is 0.001 g or 1mg. Therefore, its measurement would be more precise than a sensitive physical balance.

Conclusion:

Thus, electronic balance is the most sensitive balance in the above balances.

USEFUL INFORMATION

The precision of a balance in measuring the mass of an. the object is different for different balances. A sensitive balance cannot measure large masses. Similarly, a balance that measures large masses cannot be sensitive.

Some digital balances measure an even smaller difference of the order of 0.0001 g or 0.1 mg. Such balances are considered the most precise balance.