The dimensional formula of mobility of holes or electrons in diode is

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

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

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

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M^{1} L^{1} A^{1} T^{2}

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Solution

The correct option is A $M^{- 1} L^{0} A^{1} T^{2}$
$M o b i l i t y = \frac{d r i f t v e l o c i t y}{f i e l d} = \frac{V}{E}$
$H = \frac{V}{E} = \frac{(L T^{- 1}) (A T)}{(M L T^{- 2})} = \frac{A L}{M L T^{- 2}} = [M^{- 1} A T^{2}]$

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