Write the formula for resistance of a wire of length l and cross-section A.

Open in App

Solution

R = ρ $\frac{L}{A}$

Suggest Corrections

Similar questions

Q. A wire of a given material having length

l

and area of cross-section

A

has a resistance

8 Ω

. Determine the resistance of another wire of same material having length

2 l

and area of cross-section

\frac{A}{2}

Q. Which is the expression for resistivity of a wire of length

l

and cross-section area A?

Q. The resistance of a wire of cross-section '

a

' and length '

l

' is

R

o h m

. The resistance of another wire of the same material and of the same length but cross-section '

4 a

' will be

a) Write the formula for the resistance of a wire of length L and cross-section A.
b) A piece of wire is redrawn by pulling it until its length is doubled. Compare the new
resistance with the original value.
c) How many 176 $Ω$ resistors (in parallel) are required to carry 5 A in 220 V line?
[5 MARKS]

Join BYJU'S Learning Program

Write the formula for resistance of a wire of length l and cross-section A.

R = ρLA

R = ρ $\frac{L}{A}$