1. The excess charge at a given point in a circuit as a function of time is described by the equation q(t)=7.5-5.5t+1.8t², where the charge is in coulombs when the time is in seconds.

Part (a)Calculate the instantaneous current, in amperes, that flows through the circuit at time t₁ = 9.5 s.

Part (b)Calculate the average current, in amperes, that flows through the circuit between t₀ = 0 and t₁ = 9.5 seconds.

2. A circuit is created with a constant voltage source, a resistor and an ammeter. A second resistor is added using a rectangular block of conducting material with side lengthsabc, and the current is measured with the block connected in three different orientations as shown below.

gtheexportta com\fA / R1 R3 R4 +