Question

write the formula of resistance in terms of p,l and a . if the area is cross section of wire is mode (1)a/3 (2)3A​

Answer 1

Answer:

R = pl/a

1. R = 3pl/a

2. R = pl/3a

Answer 2

Answer:

1. R=p×l÷A

if a becomes a÷3 then resistance will be

• R=3p×l÷A

if area become 3A then resistance will be

• R÷3=p×l÷A

resistance will be maximum in 1st case