Relay Suppression Diodes

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http://forum.allaboutcircuits.com – Quick question. Need a more detailed explanation of how a suppression diode works in a DC circuit. Example would be horn circuit. Pin 86 = B+ on control side Pin 85 = Ground on control side Pin 30 = B+ on load side Pin 87 - Load Questions: a)Magnetic field collapses. Where does current go after switch is opened. Explain using conventional theory. b)Why does it not just go to ground and if it did, where would it go from there. c)What would happen if it heads back to power source? d)What would happen if there was no diode? e)Why can't the diode be placed in front of the coil instead of (Embedded)