(a)[3]
Calculate the resistivity of the metal making up wire X.
(b(i))[1]
Calculate the potential difference across resistor R.
(b(ii)1)[3]
Determine, for wire X, its resistance.
(b(ii)2)[1]
Determine, for wire X, its length.
Physics 9702 · AS & A Level · Resistance and resistivity
Resistance and resistivity — practice question
Wire X has a resistance per unit length that remains constant at $3.0\,\Omega\,\text{m}^{-1}$, and its diameter measures $0.48\,\text{mm}$.