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In the circuit shown in Figure 4, a battery supplies a constant voltage of 40 V, the inductance is 2 H, the resistance is 10,

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In the circuit shown in Figure 4, a battery supplies a constant voltage of 40 V, the inductance is 2 H, the resistance is 10Ω, and l(0) = 0.
(a) Find l(t).
(b) Find the current after 0.1s.

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