An electromagnetic wave has an electric field given by $\vec { E } = - \left( 9.0 \times 10 ^ { 5 } \mathrm {~V} / \mathrm { m } \right) \hat { j } \cos \left[ \left( 9.42 \times 10 ^ { 15 } \mathrm { rad } / \mathrm { s } \right) t - k z \right]$ . The axis of polarization of the wave is
A) $\hat { k }$
B) $\hat { j }$

C) - $\hat { j }$

D) $\hat { i }$

Question

An electromagnetic wave has an electric field given by $\vec { E } = - \left( 9.0 \times 10 ^ { 5 } \mathrm {~V} / \mathrm { m } \right) \hat { j } \cos \left[ \left( 9.42 \times 10 ^ { 15 } \mathrm { rad } / \mathrm { s } \right) t - k z \right]$ . The axis of polarization of the wave is
A) $\hat { k }$
B) $\hat { j }$

C) - $\hat { j }$

D) $\hat { i }$

Quizplus · Accepted Answer

The axis of polarization of an electromagnetic wave is determined by the direction of its electric field vector. In this case, the electric field vector is given as $\vec { E } = - \left( 9.0 \times 10 ^ { 5 } \mathrm {~V} / \mathrm { m } \right) \hat { j } \cos \left[ \left( 9.42 \times 10 ^ { 15 } \mathrm { rad } / \mathrm { s } \right) t - k z \right]$, which means it is in the direction of $\hat { j }$, making the axis of polarization $\hat { j }$.

An Electromagnetic Wave Has an Electric Field Given By the Axis of Polarization of the Wave Is A)

An Electromagnetic Wave Has an Electric Field Given By the Axis of Polarization of the Wave Is
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