वायु में \(x\)-अक्ष के अनुदिश चल रही प्रकाश तरंग की समीकरण \(E _{ y }=540 \sin \pi \times 10^4( x - ct ) Vm ^{-1}\) है तो वैद्युतचुम्बकीय तरंग क चुम्बकीय क्षेत्र का शिखर मान \(......... \times 10^{-7}\,T\) होगा। (दिया है, \(c =3 \times 10^8 ms ^{-1}\) )

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.