In order to obtain a time constant of $10$ seconds in an $RC$ circuit containing a resistance of $10^3\,\Omega,$ the capacity of a condenser should be.....$ \mu F$
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$\tau=\mathrm{RC}$
$10=10^{3} \mathrm{\,C}$
$\mathrm{C}=10^{-2} \mathrm{\,F}$
$=10000\, \mu \mathrm{F}$
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