# Solenoid Magnetic Field Help

## Homework Statement

You have 12m of 0.50mm diameter copper wire and a power supply capable of passing 17A through the wire.
a)What magnetic field strength would you obtain inside a 2.0cm diameter solenoid with the wire spaced as closely as possible?
b)What magnetic field strength would you obtain at the center of a single circular loop made from the wire?

B=u0nI
B=u0I/2r

## The Attempt at a Solution

a) n=pi*0.002=0.00628 or n=12/.00628=1909.86 not sure on this
B=4pi*E-7nI B=1.34*1076T or B=4.08*10-2
b) B=4piE-7=17/(2*.001)=1.1-3T

b is definitely wrong but I dont know why and I am completely unsure on a.
all help appreciated.

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rl.bhat
Homework Helper

## Homework Statement

You have 12m of 0.50mm diameter copper wire and a power supply capable of passing 17A through the wire.
a)What magnetic field strength would you obtain inside a 2.0cm diameter solenoid with the wire spaced as closely as possible?
b)What magnetic field strength would you obtain at the center of a single circular loop made from the wire?
n = 12/π*0.0205

Radius of the single loop = R = 12/2π

thanks for that, do you know whats wrong with a???