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  1. Scrope

    Multi variable Limit

    Homework Statement <----- The question Homework Equations The Attempt at a Solution Had this on a test today, honestly not sure how to evaluate. I know you can pass the limit to the inside of arctan but I can't see how the inside goes to...
  2. Scrope

    I Iron bar wrapped with a solenoid

    What is happening within an iron bar/iron core when it is wrapped by a solenoid with current running through the solenoid? Do electrons within the bar get displaced?