A piece of copper wire is marked ‘length $30\,\text{m}$’ and ‘diameter $0.50\,\text{mm}$’. Which instruments would be most appropriate for measuring the length and the diameter of the wire accurately?
- Alength: rule; diameter: calipers
- Blength: rule; diameter: micrometer
- Clength: tape; diameter: calipers
- Dlength: tape; diameter: micrometer