Find Field and Direction in Coaxial Coils

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SUMMARY

The discussion focuses on calculating the magnetic field inside coaxial coils with opposing currents. The inner coil, carrying 3.0A with 500 loops, generates a magnetic field of 0.0188T, while the outer coil, carrying 10A with 5000 loops, produces a field of 0.628T. Since the currents flow in opposite directions, the net magnetic field at the center is determined by subtracting the inner coil's field from the outer coil's field, resulting in approximately 0.61T. The calculations confirm that the approach of subtracting the fields is correct.

PREREQUISITES
  • Understanding of Ampere's Law
  • Familiarity with magnetic field calculations for coils
  • Knowledge of the right-hand rule for current direction
  • Basic algebra for field strength subtraction
NEXT STEPS
  • Study Ampere's Law and its applications in magnetic fields
  • Learn about the Biot-Savart Law for calculating magnetic fields
  • Explore the effects of coil configurations on magnetic fields
  • Investigate the impact of current direction on magnetic interactions
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Physics students, electrical engineers, and anyone interested in electromagnetism and magnetic field calculations in coil systems.

Canuck269
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Homework Statement



Find the field and direction inside a pair of coaxial coils. The inner coil carries 3.0A, has 500 loops and is 10cm long. The outer coil carries 10A, has 5000 loops and is 10cm long. Find the field at the center

Thats the questions, now I don't have trouble working out the numbers (At least I hope I don't). But what I'm wondering is, in the questions, the currents are going in opposite directions, one CW, one CCW. So does that mean that at the end I just subtract them?? or does that not work??

I got, the 3.0A coil creates 0.0188T. And the 10A coil creates 0.628T. So that's ~=0.61T. I hope that's right. lol
 
Last edited:
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Yes, if the currents are in opposite directions, then you subtract them. It looks ok to me.
 
hey thanks a bunch.
 

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