InterviewSolution
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InterviewSolution
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Three liquids of densities `rho_(1), rho_(2)` and `rho_(3)` (with `rho_(1) gt rho_(2) gt rho_(3)`), having the same value of surface tension T, rise to the same height in three identical capillaries. The angles of contact `theta_(1), theta_(2)` and `theta_(3)` obeyA. `(pi)/(2) gt theta_(1) gt theta_(2) gt theta_(3) ge 0`B. `0 le theta_(1) lt theta_(2) lt theta_(3) lt (pi)/(2)`C. `(pi)/(2) lt theta_(1) lt theta_(2) lt theta_(3) lt pi`D. `pi gt theta_(1) theta_(2) gt theta_(3) gt (pi)/(2)` |
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Answer» Correct Answer - B `h=(2Tcostheta_(c))/(r rhog)=`same `costheta_(c) prop rho` `rho_(1) gt rho_(2) gt rho_(3)` `costheta_(c_(1)) gt cos theta_(c_(2)) gt cos theta_(c_(3))` `0 le theta_(c_(1)) lt theta_(c_(2)) lt theta_(c_(3)) lt (pi)/(2)` |
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