What is the length of one mole of the typical cell phone that is approximately 15 cm in length?

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Some objects of more than 15 cm and less than 30 cm can be:

A rule.

A cell phone.

A pencil.

A calculator.

A laptop charger.

We have to measure it helps us to compare and to obtain physical magnitudes of different objects.

Measurement is the action of obtaining a representative magnitude of a particular object, now, to measure we need to compare and have reference points.

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Explanation:'

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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

they it depends on if one believes about radioactivity, they make a geiger counter beep but maybe it was going to beep anyway electronics do wierd things all the time or it was programmed to beep near certain metals.