Calculate the resistance of 2 m long copper wire of radius 1 mm. Resistivity of copper is 1.72 x 10-8 ohm-m.
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Calculate the resistance of 2 m long copper wire of radius 1 mm. Resistivity of copper is 1.72 x 10-8 ohm-m.
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Verified answer
R = 1.095 × 10^-2 ohm is the required answer.
GIVEN:
TO FIND:
Resistance of copper wire, R
FORMULAE:
SOLUTION:
STEP 1: TO FIND AREA:
A = π r²
Area , A = 3.14 × 10^-6 m²
STEP 2: TO FIND RESISTANCE:
R = ( ρl ) /A
ANSWER:
Resistance of coper wire , R = 1.095 × 10^-2 ohm
RESISTANCE:
RESISTIVITY: