Question

A resistor of a wire of 0.01 cm radius is 10ohms. If the resistivity of the materials of the wire is 50x10^-8 ohm metre, find the length of the wire.​

Answer 1

Answer:

Explanation:

RESISTANCE=10 OHMS

RADIUS=0.01 CM= 0.01*10^-2 M

RESISTIVITY=50*10^-8

LENGTH=?

RESISTANCE=RESISTIVITY*LENGTH/AREA

   10     = 50*10^-8*LENGTH/ PI* 0.01*0.01*10^-4

LENGTH=10*3.14*0.01*0.01*10^-4/50*10^-8

LENGTH=0.628 M.

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