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(a) दिक्काल (मुक्त आकाश) में किसी बिन्दु पर विद्युत क्षेत्र सदिश \((\overrightarrow E)\) का परिमाण 9.3 V/m है। इस बिन्दु पर चुम्बकीय क्षेत्र सदिश \((\overrightarrow B)\) का परिमाण ज्ञात कीजिए।

(b) पराबैंगनी, अवरक्त तथा X किरणों में से किसकी तरंगदैर्घ्य अधिकतम होती है।

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(a) प्रकाश का वेग C = \(\frac{\overrightarrow E}{\overrightarrow B}\)

\(\overrightarrow B = \frac{\overrightarrow E}{C} = \frac{9.3}{3 \times 10^8}\) = 3.1 x 10-8 T

(b) अवरक्त तरंगे।

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