किसी तार की त्रिज्या एक तिहाई कर दी जाती है। यदि आयतन समान रहे तो लंबाई कितनी बढ़ जाएगी?A. 3 timesB. 1 timesC. 9 timesD. 6 times

किसी तार की त्रिज्या एक ति�

1.	किसी तार की त्रिज्या एक तिहाई कर दी जाती है। यदि आयतन समान रहे तो लंबाई कितनी बढ़ जाएगी?A. 3 timesB. 1 timesC. 9 timesD. 6 times
Answer» Correct Answer - C Let the radius of wire `-1` cm Volume of wire `=pir^(2)h` `=pi(1)^(2)h=pih` New radius of wire `=1/3cm` volume of new wire `=pi(1/3)^(2)H=1/9piH` Volume of old wire `=` Volume of new wire `pih=1/9piH` `H=9h` Height of new cone is increased by 9 times.

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किसी तार की त्रिज्या एक तिहाई कर दी जाती है। यदि आयतन समान रहे तो लंबाई कितनी बढ़ जाएगी?A. 3 timesB. 1 timesC. 9 timesD. 6 times

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