An electron in a cathode$-$ray tube is accelerated through a potential difference of $10$ kV $,$ then passes through the $d=2\mathrm{.}0-cm-$wide region of uniform magnetic field in $($ Figure $1).$

Part A

What field strength will deflect the electron by $=14?$

Express your answer with the appropriate units.

$B=$

$$

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Figure

$1$ of $1$