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why the voltage drop to near zero ?

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fs4590:
i stacked 6 air coils on top of each others,each coil have about 5 mh,  all connected in series, when i pass a magnet throw the coils (  not on top of stack of coils ) , i get a reading on my multi-meter  of an average of 20v ,but when i connect a 24 ohms resistor as a load ,the voltage drops to near zero .
can anyone tell me why the voltage is disappearing ?

burnit0017:
Hi, how fast is the magnet moving? I * R = V   I'm thinking the magnet is not moving fast enough. Then you have to consider the I squared R loss of the copper coils.

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