A lump of conducting putty (modelling clay) with constant resistivity is shaped into a cylinder. The resistance $R$ across its flat ends (shaded) is recorded. The same volume of putty is then reshaped into cylinders with different lengths $L$, and for each value of $L$ the resistance $R$ across the flat ends is measured. Which graph best shows how $R$ varies with $L$?
Physics 9702 · AS & A Level · Resistance and resistivity