एक गोलक की त्रिज्या 6 सेमी. है। इसे पिघला कर 0.2 सेमी. त्रिज्या वाली एक तार बनाई गई। उस तार की लंबाई बताइए।A. 81 मी.B. 80 मी.C. 75 मी.D. 72 मी.

एक गोलक की त्रिज्या 6 सेमी. �

1.	एक गोलक की त्रिज्या 6 सेमी. है। इसे पिघला कर 0.2 सेमी. त्रिज्या वाली एक तार बनाई गई। उस तार की लंबाई बताइए।A. 81 मी.B. 80 मी.C. 75 मी.D. 72 मी.
Answer» Correct Answer - D Volume of sphere `=` volume of wire `4/3pir_(s)^(3)=pir_(w)^(2)h` `h=(4/3xxpixx6^(3))/(pi0.2xx0.2)` `h=(4xx6xx6xx6)/(3xx0.2xx0.2)` `=7200cm=72m`.

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