Which of the following has/have zero average value in a plane electromagnetic wave?

Which of the following have zero average value in a plane electromagnetic wave?

Which of the following have zero average value in a plane electromagnetic wave?

Which of the following have zero average value in a plane electromagnetic wave?

Which of the following have zero average value un a plane electromagnetic wave? (i)electric field (ii)magnetic field (iii) electric energy (iv) magnetic enegry

Which of the following has/have value equal to zero ?

Which of the following has // have value equal to zero ?

Which of the following has // have value equal to zero ?