Question

I need some numericals of electric current

Answer 1

Question 1

A wire of length 3 m and area of cross-section 1.7 × 10-6 m2 has a resistance 3 × 10-2 ohm.

a. What is the formula for resistivity of the wire and what is the unit of it

b. Calculate the resistivity of the wire

Solution

a. Resistivity of the wire is given by

ρ

=

R

A

L

And It unit is Ohm-m

b. In this case

L=3 m

A

=

1.7

×

10

−

6

m2

R

=

3

×

10

−

2

ohm

So

ρ

=

1.7

×

10

−

8

Ohm-m

Step-by-step explanation:

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