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(II) An electron has an initial velocity $\vec { \mathbf { v } } _ { 0 } = \left( 8.0 \times 10 ^ { 4 } \mathrm { m } / \mathrm { s } \right) \hat { \mathbf { j } }$ . It enters a region where $\quad \vec { \mathbf { E } } = ( 2.0 \hat { \mathbf { i } } + 8.0 \hat { \mathbf { j } } ) \times 10 ^ { 4 } \mathrm { N } / \mathrm { C }$

(a) Determine the vector acceleration of the electron as a function of time. $( b )$ At what angle $\theta$ is it moving (relative to its initial direction) at $t = 1.0 \mathrm { ns } ?$

A) $-3.5 \times 10^{15} \mathrm{m} / \mathrm{s}^{2} \hat{i}-1.4 \times 10^{16} \mathrm{m} / \mathrm{s}^{2} \hat{\mathfrak{j}}$

B) $\theta=166^{\circ}$ counter clockwise

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University of Michigan - Ann Arbor

Numerade Educator

Hope College

McMaster University

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