Write the dimensions of $a/b$ in the relation $P = \frac{{a - {t^2}}}{{bx}}$ , where $P$ is pressure, $x$ is the distance and $t$ is the time 

  • A

    ${M^{ - 1}}{L^0}{T^{ - 2}}$

  • B

    ${M^1}{L^0}{T^{ - 2}}$

  • C

    ${M^1}{L^0}{T^{ 2}}$

  • D

    ${M^1}{L^1}{T^{ - 2}}$

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  • [JEE MAIN 2021]

A small steel ball of radius $r$ is allowed to fall under gravity through a column of a viscous liquid of coefficient of viscosity $\eta $. After some time the velocity of the ball attains a constant value known as terminal velocity ${v_T}$. The terminal velocity depends on $(i)$ the mass of the ball $m$, $(ii)$ $\eta $, $(iii)$ $r$ and $(iv)$ acceleration due to gravity $g$. Which of the following relations is dimensionally correct

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Choose the correct answer from the options given below

  • [JEE MAIN 2021]