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CBSE Class 10 Answered

Please answer ques 9 given on the photo. 
question image
Asked by riyamaths | 31 May, 2018, 08:18: PM
answered-by-expert Expert Answer
When diameter is doubled, area becomes 4 times of its original value. Since resistance inversely proportional to area, resistance decreases by 4 times. Hence the changed resistance is 2.5Ω.
 
When length is doubled, resistance also doubled because resiatance is directly proportional to length. Changed resistance is 20 Ω.
Answered by Thiyagarajan K | 08 Jun, 2018, 06:20: PM
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