An electromagnetic wave is transporting energy in the negative ‘z’ direction. At a certain point and certain time the direction of electric field of the wave is along positive ‘y’ direction. [2023]

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Q.
An electromagnetic wave is transporting energy in the negative ‘z’ direction. At a certain point and certain time the direction of electric field of the wave is along positive ‘y’ direction. What will be direction of the magnetic field of the wave at that point and instant [2023]

1 Positive direction of ‘z’

2 Negative direction of ‘y’

3 Positive direction of ‘x’

4 Negative direction of ‘x’

Ans.
(3)

$\bar{S} = - \hat{k}, \bar{E} = \hat{j}, \bar{B} = ?$

$\bar{S} = \bar{E} \times \bar{B}$

Here $\bar{B}$ should be along positive $x$ -direction.

Solution

Q.
An electromagnetic wave is transporting energy in the negative ‘z’ direction. At a certain point and certain time the direction of electric field of the wave is along positive ‘y’ direction. What will be direction of the magnetic field of the wave at that point and instant [2023]

1 Positive direction of ‘z’

2 Negative direction of ‘y’

3 Positive direction of ‘x’

4 Negative direction of ‘x’

Ans.
(3)

$\bar{S} = - \hat{k}, \bar{E} = \hat{j}, \bar{B} = ?$

$\bar{S} = \bar{E} \times \bar{B}$

Here $\bar{B}$ should be along positive $x$ -direction.

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Solution

Q. An electromagnetic wave is transporting energy in the negative ‘z’ direction. At a certain point and certain time the direction of electric field of the wave is along positive ‘y’ direction. What will be direction of the magnetic field of the wave at that point and instant [2023]

1 Positive direction of ‘z’

2 Negative direction of ‘y’

3 Positive direction of ‘x’

4 Negative direction of ‘x’

Ans. (3) S¯=-k^, E¯=j^, B¯=? S¯=E¯×B¯ Here B¯ should be along positive x-direction.

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Q.
An electromagnetic wave is transporting energy in the negative ‘z’ direction. At a certain point and certain time the direction of electric field of the wave is along positive ‘y’ direction. What will be direction of the magnetic field of the wave at that point and instant [2023]

Ans.
(3)

$\bar{S} = - \hat{k}, \bar{E} = \hat{j}, \bar{B} = ?$

$\bar{S} = \bar{E} \times \bar{B}$

Here $\bar{B}$ should be along positive $x$ -direction.