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The fact that he uses batteries is a decoy: batteries typically do not possess an electric field that extends that far out into air.
Even if they did, they couldn't interact with a nickel (non magnetic, no charge).
The big secret to this trick is the utilization of a magician's tool known as invisible thread. The thread forms a loop between the coke can and the CD stack, so that when he drags the coke can, the thread lifts and straightens out. This carries the card upward. The coin serves to keep the center of gravity of the card between the two sides of the loop.
Even if they did, they couldn't interact with a nickel (non magnetic, no charge).
The big secret to this trick is the utilization of a magician's tool known as invisible thread. The thread forms a loop between the coke can and the CD stack, so that when he drags the coke can, the thread lifts and straightens out. This carries the card upward. The coin serves to keep the center of gravity of the card between the two sides of the loop.
-James
Ph.D. Student in physics