The voltage v (in volts) across an electirc circuit is given by ohm’s law: v = ir, where i is the current (in amperes) flowing through the circuit and r is the resistance (in ohms). if two circuits, one with resistance r1 and the other with resistance r2, are placed in parallel, then their combined resistance r is given by 1 r = 1 r1 + 1 r2 . suppose the current is 2 amperes and increasing at a rate of 10−1 amperes per second, r1 is 3 ohms and increasing at 0.5 ohms per second, and r2 is 5 ohms and decreasing at 0.1 ohms per second. calculate the rate at which the voltage is changing.