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When do you include the negative in current divider circuits? In this example In this example the current is negative and I do not understand why.

Example 7.1 Determining the Naturasose Example 7.1 Determining the Natural Response of an RL Circuit RL Circuit The switch in the circuit shown in Fig. 7.7 has been closed for a long time before it is opened at -0. Find b) We find the current in the 40? resistor most easily by using current division; that is, 10 a) id) for t 0, b) 1,0) for t 2 o, -L101 40. io Note that this expression is valid for0 because io-0att-0.The inductor behaves as a short circuit prior to the switch being opened, producing an instantaneous change in the current io. Then, d) the percentage of the total energy stored in the 2 H inductor that is dissipated in the 10 ? resistor. i,(1)--4e-5A, 12 o. c) We find the voltage vo by direct application of Ohms law Figure 7.7 ? The circuit for Example 7.1.

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