- #1

cuallito

- 95

- 1

**1. Problem statement**

A very long straight solenoid has a diameter of 3cm, 40 turns per cm, and a current of .275 A. A second solenoid is with larger diameter is slipped over it with N turns per cm, and the current is ramped down to zero over 0.2 s.

a) What is the emf induced in the second coil if it has a diameter of 3.6cm and N=6?

b) The diameter is 7.2cm and N=12 ?

## Homework Equations

B=μNI

## The Attempt at a Solution

Wouldn't the answer to both (a) and (b) be zero, since the magnetic field outside a solenoid is basically zero?

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