# CBSE Class 10 Answered

**How to find the no of rounds?**

Asked by sonali221994 | 22 Dec, 2009, 12:38: PM

Expert Answer

We have to completely wrap the CSA of cylinder. Since in one wrap of copper wire of 3 mm diameter, a 3 mm height of 12 cm heighted cylinder is consumed.

Hence to find how many such wraps make up the required 12 cm, we divide 12 cm/3 mm = 120 mm/3 mm = 120 wraps or rounds.

The length in one wrap = πD = 3.14x10 cm = 31.4 cm.

**Total length of wire = 120x31.4 = 3768 cm**

The volume of the wire = cross sectional areaxlength = 3.14x0.3^{2}x3768/4 = 266.21 cm^{3}

**Mass of wire = densityxvolume = 8.88x266.21 = 2364 gm = 2.4 kg.**

Regards,

Team,

TopperLearning.

Answered by | 22 Dec, 2009, 03:37: PM

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