Question

a wire of resistance 3 ohm and length 10 cm is stretched to length 30 cm​

Answer 1

Answer:

$27ohm$

Step-by-step explanation:

R1/R2=(L1/A1)/(L2/A2)

3/R2=(10/3A2)/(30/A2)

3/R2=1/9

R2=27 ohm