Magnetism, Credit-Card magnetic strips

Nnk

Homework Statement

Experiments carried out on the television show Mythbusters determined that a magnetic field of 1000 gauss is needed to corrupt the information on a credit card's magnetic strip. (They also busted the myth that a credit card can be demagnetized by an electric eel or an eelskin wallet.) Suppose a long, straight wire carries a current of 2.5 A. How close can a credit card be held to this wire without damaging its magnetic strip?

Homework Equations

Magnetic field of a solenoid:

Where n=N/L

The Attempt at a Solution

Homework Helper
Hi Nn,

Your relevant equation isn't for a simple straight wire. Look e.g. here

Oh, and: next time use the template as it's intended (I.e. show some work under 3, not the answer from the back of the book) :)

Nnk
Hi Nn,

Your relevant equation isn't for a simple straight wire. Look e.g. here

Oh, and: next time use the template as it's intended (I.e. show some work under 3, not the answer from the back of the book) :)

Thanks for pointing that out! I didn't know how to calculate it, so I put the correct answer there for those who could help