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Helen adjusts the armature of an electric generator by increasing the number of coils around the iron core. What is Helen most likely trying to do?
maintain the direction of the current flow
reverse the direction of the current flow
decrease the amount of current
increase the amount of current
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Increase the amount of current.
Reason: By Faraday’s law the induced emf is proportional to the number of turns (emf ∝ N dΦ/dt). More coils around the iron core increases the induced voltage and thus (for a given load) increases the current. It does not change the direction of the current.
Reason: By Faraday’s law the induced emf is proportional to the number of turns (emf ∝ N dΦ/dt). More coils around the iron core increases the induced voltage and thus (for a given load) increases the current. It does not change the direction of the current.
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