what is the effect of the following variables of the strength of electromagnets
1. tightness of the wire coiled around the nail
2. number of coils around the nail
3. number of dry cells used
4. size of nail
1. tightness of the wire coiled around the nail
2. number of coils around the nail
3. number of dry cells used
4. size of nail
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Answer:
4.Today, the penny system refers specifically to nail length. A 2d nail is 1 inch long, for example, while a 16d nail is 3 1/2 inches long. Each higher number in the penny system represents a 1/4-inch length increase, up to a 12d nail (3 1/4 inches long).
Nail Measurement Guide: 2d to 16d
A 2d nail is 1 inch long and a 3d nail is 1.25 inches long. 4d nails measure 1.5 inches and 5d nails measure 1.75. A 6d nail is 2 inches long and an 8d nail is 2.5 inches long. 12d nails are 3.25 inches long and 16d nails (16 penny) are 3.5 inches long.
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