While playing with voltage multiplication and capacitors, I began to think if my experiments could damage my electrical equipment (eg. mobile phone) by creating strong magnetic fields over a short duration. (for example when experimenting with coil gun technology)
So far, I have restrained myself to human-safe voltages for many reasons.
Yet, I'm still curious how much electrical power would one need to create magnetic field strong enough to damage or disturb surrounding electronics. This means field strong enough to create unexpected electrical potentials and currents in devices.
Can this happen without some heavy technologies? Is there maybe something that prevents this from happening at all? (strong magnets near mobile phones seem to do no harm...)