The time constant in RC circuits:

$\overline{){\mathbf{\tau}}{\mathbf{=}}{\mathbf{R}}{\mathbf{C}}}$

**(a)**

R = 0.0340Ω

τ = 0.200 µs = 0.200 × 10^{-6} s

The duration of a photographic flash is related to an RC time constant, which is 0.200 µs for a certain camera.

(a) If the resistance of the flash lamp is 0.0340 ohm during discharge, what is the size of the capacitor supplying its energy?

(b) What is the time constant (in s) for charging the capacitor, if the charging resistance is 850 kΩ ?

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