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The electronic flash attachment for a camera contains a capacitor for storing the energy used to produce the flash. In one such unit, the potential difference
between the plates of an 850 µF capacitor is 280 V.
(a) Determine the energy that is used to produce the flash in this unit.
(b) Assuming that the flash lasts 3.9 x 10-3 s, find the effective power or wattage of the flash.

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