Given,

${R_1} = 1\,\Omega $                     $C_1 \,= 2\,\mu F$

${R_2} = 2\,\Omega $                     $C_2 \,= 4\,\mu F$

The time constants ( in $\mu\, s$) for the circuits $I, II, III$ are respectively

  • A$18,18 / 9,4$
  • B$18,4,8/9$
  • C$4,8/9,18$
  • D$8/9,18,4$
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