Question 1168364
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This question is related to electricity and magnetism in physics, more specifically transformers.

A coil of 600 turns, wound using 90.0 m of copper wire, is connected to a 6.0-V battery and is just able to support the weight of
a toy truck. If 200 turns are removed from the coil but the wire is
uncoiled and left in the circuit, what battery voltage would be
needed in order to support the truck?

The supposedly correct answer was 18 volts however I don't know how they got there
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This question does relate to wire coils, but does not relate to transformers.


Do not miss these two different conceptions/items.


Transformers are not attached to batteries,
because transformers work at alternate current, 
while batteries DO NOT CREATE alternate current.


Batteries provide constant current, only.