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**1. Homework Statement**

In Solenoid, is emf E= N. d(phi)/dt, or is it simply d(phi)/dt? Some books contain the latter one. It was not a big deal until i gave a thought about it. Since increasing the N, we are actually increasing the value of n, thus increasing B= (mu) .n.I

So, by placing N in front of the differential, are not we considering the same thing twice?

**2. Homework Equations**

**3. The Attempt at a Solution**