A rectangular sample of a metal is $2\mathrm{.}9$ cm wide and $690m$ thick. When it carries a $46$ A current and is placed in a $0\mathrm{.}90$ T magnetic field it produces a $7\mathrm{.}0V$ Hall emf. Determine the following quantities:

Part B

The drift speed of the conduction electrons.

Express your answer using two significant figures.

$v_d=$

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Part C

The density of free electrons in the metal.

Express your answer using two significant figures.

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$n=$ electrons per $m^3$