Time constant of a capacitance circuit may be defined as the time during which voilage :
(a) rises to 63.2% of its final steady value
(b) rises to 38.6% of its final steady value
(c) falls to 38.6% of its final steady value
(d) none of these
(b) rises to 38.6% of its final steady value
(c) falls to 38.6% of its final steady value
(d) none of these
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