Question

please answer it please​

Answer 1

SoluTion :-

Resistance of a wire,

$\rm {R=\rho \frac{L}{A} }\\\\\\\rm {A=\rho \frac{L}{R} }$

Where,

⇢ ρ - Resistivity

⇢ L - Length of the conductor

⇢ A - Area of a cross-section of the conductor

Since,

﹥Length is directly proportional to Resistance

﹥Area of cross-section is inversely proportional to Resistance.

Therefore,

If length is doubled, the resistance will be doubled.

Or,

If length is 2L, then resistance will be 2R.

If Resistance has to remain the same as R,

the Area of cross-section is doubled as 2A