Question

a current of 2A is drawn by a wire. if the length of the wire is double then the amount of current drawn by the wire would be​

Answer 1

$The electrical resistance of a wire would be expected to be greater for a longer wire, less for a wire of larger cross sectional area, and would be expected to depend upon the material out of which the wire is made.The resistance of a wire can be expressed as R=ρAL, </p><p>where,</p><p>ρ - Resistivity  - the factor in the resistance which takes into account the nature of the material is the resistivity</p><p>L - Length of the conductor</p><p>A - Area of cross section of the conductor.</p><p>From this relation, we observe that the length is directly proportional to the resistance and the area of cross section is inversely proportional to the resistance.</p><p>That is, if L becomes 2 L, R becomes 2 R. R′=ρA2L. So, R = 2R'.</p><p>Hence, If the length of a wire is doubled, then its resistance becomes 2 times.</p><p></p><p>$