Question

if 10 turns of wire is recoiled on a cylindrical reel of radius 3.5 cm.find the length of the wire

Answer 1

Find 1 turn:

1 turn = 2πr

1 turn = 2π(3.5) = 22 cm

Find 10 turns:

1 turn = 22 cm

10 turns = 22 x 10 = 220 cm

Answer: The length of the wire is 220 cm

Answer 2

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2×22/7×3.5

=)154/7

=)22


Now,


Taking 10 turns =22×10
=220



Conclusion:- Length of Wire=)220 Centimetres