Initially, an inductor with no resistance carries a constant ...

[Tazate]

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.

Question 2

What is the difference in elevation, measured in feet, between the highest and lowest points on the map?

[meltdown117]

Answer to Question 1

4

Answer to Question 2

The answer depends on the map the students are using.