Question

Q.5) Find length of a metal wire of radius 0.1mm needed to prepare a coil of
resistances 20ohm .The resistivity of the metal is 3.14x10-8 ohm meter.​

Answer 1

Answer:

20

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Explanation:

R=rho × l/a

20 = 3.14×10^(-8) × L/ 3.14 × 1 × 10^-8

20= L