Question

the resistance of resistor 4 ohm where length is l and cross section area a find the value of resistance of another register is length 1/2 and cross section area 2A​

Answer 1

Explanation:

R1/R2 = [l/a] / [(l/2) /(2a)]

4/R2 = [l/a] / [(l/4a]

4/R2 = 4/1

R2 = 1 ohm

Answer 2

Answer:1 ohm

Explanation:R=L/kA

R=4then

4=L/KA.......1

R=L/4Ak..... 2

Devided 1/2