A high-speed flash unit for sports photography requires a flash voltage v 0 3 V and dv t

Chapter 7, Problem DP7-4

(choose chapter or problem)

A high-speed flash unit for sports photography requires a flash voltage \(v\left(0^{+}\right)=3 \mathrm{~V}\) and

                              \(\left.\frac{d v(t)}{d t}\right|_{t=0}=24 \mathrm{~V} / \mathrm{s}\)

The flash unit uses the circuit shown in Figure DP 7-4. Switch 1 has been closed a long time, and switch 2 has been open a long time at t = 0. Actually, the long time in this case is 3 s. Determine the required battery voltage \(V_{\mathrm{B}}\) when C = 1 / 8 F.