Question

Q₁4 A metallic wire of length 7 cm th and Cross section area 12 cm² has resistance 60 ohm. Calculate resistivity of metallic wire .​

Answer 1

Explanation:

Resistance(R)=

A

ρl

where ρ is the resistivity

Here from the given question

l=3m A=1.7×10

−6

m

2

ρ=

l

RA

ρ=

3

(3×10

−2

)(1.7×10

−6

)

=1.7×10

−8

Ωm

Keeping the values we get the value of ρ=1.7×10

−8

Ωm

Answer 2

Answer:

1. 7cm across + 12cm = 19
2. resistance 60 ohm + 19 = 79.

Explanation:

We have to :

1. plus seven with twleve and the answer is nineteen now we have to do 60 ohm with nineteen equal is seventy nine.