Question

A cylindrical conductor of length L and uniform area of cross section A has resistance R.Another conductor of length 2.5L and resistance 0.5R of the same material has area of cross section?​

Answer 1

Answer:

5A

Explanation:

Answer 2

The area of cross section of the conductor of length 2.5 L and resistance 0.5 R is 5A.

• Resistance of a conductor  

= (resistivity of the conductor) * (length of conductor) / (area of cross section)

• Let area of cross section of conductor with length 2.5L be x.

• According to the question,

R = ρL / A    ……..(i)

and,

0.5 R = ρ (2.5 L) / x      ……….(ii)    

• Using equation (i) and (ii) , we get x = 5A