Question

plzz answer this.....fast ques no 1

Answer 1

Ans. Number of rounds to cover 12 cm, i.e. 120 mm = 120/3 = 40

Here, Diameter = 10 cm, Radius (r)= 10/2 cm

Length of the wire in completing one round

= 2πr=10πcm

Length of the wire in completing 40 rounds

=10π×40=400π cm

Radius of the copper wire =3/2  mm

= 3/20 cm

Volume of wire = π(3/20)²400π

= 9π² cm³

Mass of the wire = 9×(3.14)²8.88

= 787.98 g