First slide

Ohm's law

Question

When the length and area of cross-section both are doubled, then its resistance

Easy

A

Will become half
B

Will be doubled
C

Will remain the same
D

Will become four times

Solution

$\begin{array}{l} R_{1} \propto \frac{l}{A}, R_{2} \propto \frac{2 l}{2 A} i . e ., R_{1} \propto \frac{l}{A} \\ ∴ R_{1} = R_{2} \end{array}$

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