Initially, an inductor with no resistance carries a constant current. Then the current is brought to a new constant value twice as large. After this change, when the current is constant at its higher value, what has happened to the emf in the inductor?
1.It is larger than before the change by a factor of 4.
2.It is larger by a factor of 2.
3.It has the same nonzero value.
4.It continues to be zero.
5.It has decreased.
4
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This is a science physics question on forces. I dont understand please help. Thank you
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