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एक 90 वाट , 30 वोल्ट के बल्ब को 120 वोल्ट की सप्लाई पर जलाना है । इसके लिये बल्ब के श्रेणीक्रम में एक तार लगायेंगे जिसका प्रतिरोध होगा :

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एक 90 वाट , 30 वोल्ट के बल्ब को 120 वोल्ट की सप्लाई पर जलाना है । इसके लिये बल्ब के श्रेणीक्रम में एक तार लगायेंगे जिसका प्रतिरोध होगा :
A. 10 ओम
B. 20 ओम
C. 30 ओम
D. 40 ओम
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Correct Answer - c
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