IB Physics SL B 5 12 Resistance and Resistivity Questions

Practise IB Physics SL B.5.12 by calculating resistance and resistivity, tracking length and cross-sectional area, and interpreting wire data and graphs.

Exam points

Explain the relativity of simultaneity for events separated in space.
Use Lorentz transformations to determine whether events are simultaneous in different inertial frames using complete evidence.

[Maximum number: 2]

A cable consisting of many copper wires is used to transfer electrical energy from a generator to an electrical load. The copper wires are protected by an insulator.

Figure for Question IB Physics SL B 5 12 Resistance and Resistivity Questions question 1 — IB Physics SL

The cable consists of 32 copper wires each of length 35 km . Each wire has a resistance of $64 \Omega$ . The resistivity of copper is $1.7 \times 10^{-8} \Omega \mathrm{~m}$ .

Calculate the radius of each wire.

A=\frac{(1.7\times10^{-3}\,\Omega\,\mathrm{m})(35\times10^3\,\mathrm{m})}{64\,\Omega}=9.3\times10^{-6}\,\mathrm{m^2}

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IB Physics SL B 5 12 Resistance and Resistivity Questions question 1