Question

6. Resistance of a given wire of length 'l' is 3 ohms. The wire is stretched uniformly
such that its length becomes 2'l'. Find the new resistance of the stretched wire.​

Answer 1

Answer:

Because Resistance is directly Proportional to length. and Inversely Proportional to cross-section area

Explanation:

Answer 2

Answer:

V

1

=V

2

L

1

A

1

=L

2

A

2

A

1

L

1

=

A

2

L

2

⇒

A

2

A

1

=

1

2

R

2

R

1

=(

L

2

L

1

)(

A

1

A

2

)

R

2

R

1

=

2

1

×

2

1

R

2

=4R

1

=12Ω

R

AB

=

9

2R

2

=

3

2

×4

R

AB

=

3

8

Ω

Explanation:

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