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Current in a Solenoid

  • #1
191
0

Homework Statement



A 27.0-cm long solenoid 1.25 cm in diameter is to produce a field of 0.215 T at its center. How much current should the solenoid carry if it has 900 turns of the wire?

Homework Equations



B = μIN / l

The Attempt at a Solution



Why am I given the diameter plus the length? Everything else is obvious except this concept. I thought l would equal = 0.27 m. Should I add 0.625 + 0.27 m because the magnetic field is produced at the center?
 

Answers and Replies

  • #2
537
1
you don't need the diameter at all for this problem ;)
 
  • #3
191
0
Aha! Extra information! Thank you.
 

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