Question

resistance of magnesium wire is length 2m and 30 degree celsius is 40 home if its resistivity is 1.8 into 10 ^ - 18 calculate its area of cross section of the wire​

Answer 1

Answer:

Resistance (R) = 50 Ω

Length of the wire ( l ) = 2 m

Diameter of the wire = 0.6 mm

Radius = 0.6/2  = 0.3 mm= 3 × 〖10〗^(-4)m

Resistivity (ρ) = ?

Area of cross sectional area of wire (A) = πr^2

= 3.14 ×〖( 3 × 〖10〗^(-4))〗^2  

=3.14×9×〖10〗^(-8)

= 28.26 × 〖10〗^(-8)m

We know,

ρ = RA/l

ρ = 〖50 × 28.26 ×10〗^(-8)/2

ρ = 25 × 28.26 × 〖10〗^(-8)

ρ = 706.5 × 〖10〗^(-8)

Explanation:

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