MCQ
Electric flux through surface $s_1$


- Ais minimum
- Bis maximum
- Cequal to $s_2$ but less than $s_4$
- ✓equal for all surfaces

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${z_1} = a\cos (kx - \omega \,t)$.....$(A)$
${z_2} = a\cos (kx + \omega \,t)$.....$(B)$
${z_3} = a\cos (ky - \omega \,t)$..... $(C)$

