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Physics

Grade-9

Easy

Question

Identify the correct relation between resistance, resistivity, and area of cross-section and length.

$R = \frac{ρ l}{A}$
$R = \frac{ρ A}{l}$
$R = \frac{1}{ρ l A}$
$R = \frac{l}{ρ A}$

hint Hint:

Resistivity is the resistance of a conductor across a unit cross-sectional area per length.

The correct answer is: $R equals space space fraction numerator rho l over denominator A end fraction$

$R equals space space fraction numerator rho l over denominator A end fraction$
Here,
R= resistance
ρ = resistivity
l = length of the wire
A = area of the cross-sectional

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