Problem deal with the la circuit of Fig. 2.7.7, a series circuit containing an inductor...

Problem deal with the la circuit of Fig. 2.7.7, a series circuit containing an inductor with an inductance of L. henries, a resistor with a resistance of R ohms, and a source of electromotive force (emf), but no capacitor. In this case Eq. (2) reduces to the linear first-order equation.

In the circuit of Fig. 2.7.7, suppose that L = 5 H, R = 25 Q, and the source E of emf is a battery supplying 100 V to the circuit. Suppose also that the switch has been in position 1 for a long time, so that a steady current of 4 A is flowing in the circuit. At time t = 0, the switch is thrown to position 2, so that Find I(t).