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Question

Two wires of same metal have the same length but their cross-section area are in the ratio 3 : 2. They are joined in series. If the resistance of the thinner wire is 9 Ω then total resistance of the combination will be

समान धातु के दो तारों की लम्बाई समान है लेकिन इनके अनुप्रस्थ काट क्षेत्रफल का अनुपात 3 : 2 है। इन्हें श्रेणी में संयोजित किया जाता है। यदि पतले तार का प्रतिरोध 9 Ω है, तब संयोजन का कुल प्रतिरोध होगा

A
15 Ω
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B
10 Ω
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C
18 Ω
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D
6 Ω
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