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¹ Lee, J.Y. (2013). “Private tutoring and its impact on students' academic achievement, formal schooling, and educational inequality in Korea.” Unpublished doctoral thesis. Columbia University.
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that supplies 
of current. The transformer steps up the potential to 
having a secondary coil with 
turns. How many turns does the primary coil have?
long solenoid has a current increase from zero to 
in 
. The induced EMF magnitude is 
. Find the inductance.