Which balance is the centigram balance? 1) a2) b

It is B balance, because it has a 0,01 g divisions scale. The minimun division in A balance is only 0,1 g, i.e, decigram measurement.

B

Explanation: 1 gram equals to 100 centigrams. We can also say that, 1 centigram equals to 0.01 gram.

From above centigram to gram conversion factor, there are two decimal places in 0.01 gram. So, a centigram balance is the one that could read the mass of a matter(object) to two decimal places.

Balance A can only read to one decimal place where as balance B can read the mass up to two decimal places.

Hence, balance B is the centigram balance.

c. because step up transformer steps up the input voltage i.e increases the input voltage  

the number of turns are greater on the secondary side of step up transformer  

transformer does not handle dc current