- #1
burntoastt
- 5
- 1
I'm making a solenoid electromagnet for gcse demonstration purposes and I'm trying to get a strong
, clear magnetic effect. I'v wrapped about 100 turns of enamel plated copper wire around a 4" bolt and also a 4" ferrite rod, and am applying 9v DC from a pp3 battery cell.
In both cases I got a barely noticeable magnetic field of attraction when tested with a compass, not satisfactory.
Any ideas on how i can most simply improve upon this? e.g Should i add more coils? If so how many? And should i increase the voltage?
Also does it matter if the bolt is galvanised?
The ferrite rod was from an old radio, is that ok? and is it better than an iron rod? e.g a bolt.
![Muscle :muscle: :muscle:](/styles/physicsforums/xenforo/smilies/icons/newicons/muscle.png)
In both cases I got a barely noticeable magnetic field of attraction when tested with a compass, not satisfactory.
![Flashlight :flashlight: :flashlight:](/styles/physicsforums/xenforo/smilies/icons/flashlight.png)
Also does it matter if the bolt is galvanised?
The ferrite rod was from an old radio, is that ok? and is it better than an iron rod? e.g a bolt.