The bulk modulus of a substance is the ratio of a small decrease in pressure to the resulting fractional increase in volume: d p dv show that b (5/3) p, in the free electron gas model, and use your result in problem 521 (d) to estimate the bulk modulus of copper. comment: the observed value is 13.4 × 100 n/m2, but don't expect perfect agreement-after all, we're neglecting all electron- nucleus and electron electron forces! actually, it is rather surprising that this calculation comes as close as it does.

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Ohm's law tells you that i = v/r where v is equivalent voltage and r is equivalent resistance of the circuit
since all circuits have the same voltage, your question is really asking which circuit has the lowest total resistance, since the lower the resistance, the higher the current
circuit a has a resistance of 5 ohms; circuit c is in series so has a resistance of 10 ohms; circuit b is in parallel and therefore has a resistance of 2.5 ohms (review your notes on adding resistances in parallel and series); therefore b has the highest current