what is post office box ? explain how does it work
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Post Office Box, Physics named it so because it has a shape of box and was designed to find resistance of electric cables and telegraph wires. ... Coils of wire are wound non-inductively, mounted in the body of the box, and have a negligible temperature coefficient. Pairs of ratio arms are each 10, 100, 1000 ohms.
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Answer:
Post Office Box, Physics named it so because it has a shape of box and was designed to find resistance of electric cables and telegraph wires. ... Coils of wire are wound non-inductively, mounted in the body of the box, and have a negligible temperature coefficient. Pairs of ratio arms are each 10, 100, 1000 ohms.
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