Which properties of plastics cause a problem when the container is empty

The Properties of plastics that cause a problem when the container is empty is that it is made up of many chemicals which use to make the plastic hard . they are harmful for human health. specially (BPA)

yes they ca   is ur ansswerrr

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