5 × 10-6 C·m द्विध्रुव आघूर्ण वाला एक विद्युत द्विध्रुव, 4 × 105 N/C परिमाण के एकसमान विद्युत क्षेत्र की दिशा के साथ संरेखित है। फिर द्विध्रुव को विद्युत क्षेत्र के सापेक्ष 60° के कोण से घुमाया जाता है। द्विध्रुव की स्थितिज ऊर्जा में परिवर्तन क्या है?

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  1. 0.8 J
  2. 1.0 J
  3. 1.2 J
  4. 1.5 J

Answer (Detailed Solution Below)

Option 2 : 1.0 J
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सही विकल्प: (2) 1.0 J है। 

दिया गया है:

p = 5 × 10-6 C·m

E = 4 × 105 N/C

θi = 0°,   θf = 60°

ΔU = Uf - Ui

= -pE cos θf - ( -pE cos θi )

= pE (cos θi - cos θf)

= 5 × 10-6 × 4 × 105 × (1 - 1/2) = 1 J

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