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Q140EasyVector Calculus

एक सदिश को सोलेनॉइडल (solenoidal) कहा जाता है जब उसका

उत्तर और चरणबद्ध हल
सही उत्तर: A. अपसरण शून्य हो
संक्षिप्त व्याख्या

सोलेनॉइडल सदिश क्षेत्र अपसरण-मुक्त होता है: ∇·A = 0। भौतिक रूप से, क्षेत्र के भीतर कोई शुद्ध स्रोत या सिंक नहीं होता।

विस्तृत हल (मूल भाषा में)

Concept & Reasoning

Divergence measures the local net outward flux density of a vector field. If divergence is zero everywhere in a region, the field is called solenoidal. Magnetic flux density B is a classic example because ∇·B=0 expresses the absence of magnetic monopoles. Curl is a different operator that measures local rotation and does not define solenoidality.

How to Solve It in the Exam

Solenoidal = divergence zero; irrotational = curl zero.

Important Exam Point

Pair the two vocabulary words with the correct vector operator.

Quick Trick

Solenoidal = divergence zero; irrotational = curl zero.

Common Mistake

Do not confuse solenoidal with curl-free; a field can be divergence-free and still have nonzero curl.

Solution diagram – एक सदिश को सोलेनॉइडल (solenoidal) कहा जाता है जब उसका
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