Question

Lengths of two wires of same material are in ratio 2:3 and their radii have the ratio 1:2.

Then ratio of their resistances is
41:3
B) 4:3
C) 1:6
D) 8:3​

Answer 1

Answer:

hmmmmmmmmmmmmmmmmmm

Answer 2

Answer:

so your answer is given below

Explanation:

We know that

R

1

=ρ

A

1

I

1

=ρ

πr

1

2

I

1

R

2

=ρ

πr

2

2

I

2

R

2

R

1

=

I

2

I

1

×(

r

1

r

2

)

2

V/I

2

V/I

1

=

I

2

I

1

⋅(

r

1

r

2

)

2

(∵ wire connected in parallel)

I

1

I

2

=

4

3

×(

3

2

)

2

I

1

:I

2

=9×4:4×3

=3:1