18)
an electromagnet is created using a battery, an insulated copper wire and an iron nail. the wire is wra
times and attached to the battery. which pair of changes will definitely increase the strength of the electr
increase the voltage of the battery and decrease the number of turns of the
coil.
decrease the voltage of the battery and decrease the number of turns of
the coil.
increase the voltage of the battery and increase the number of turns of the
coil.
decrease the voltage of the battery and increase the number of turns of
the coil.
19)
describe how resistance affects the flow of current in a circuit.
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Ответ:
(A
Explanation:It has a woody stem with a layer of cambium that produces xylem and phloem