Question

A wire of length 15cm has a cross sectional area of 0.20,what is its volume?

Answer 1

Explanation:

Correct option is D)

Given that,

Cross section area of wire , A=5.0×10

−6

m

2

Resistivity of wire , ρ=50×10

−8

Ωm

Let l be the length of wire

Potential difference across wire , V=6.0 V

Current through the wire , I=3.0 A

∴ Resistance of wire , R=

I

V

=

3

6

=2 Ω

Also , R=ρ

A

l

⟹2=50×10

−8

×

5.0×10

−6

l

⟹l=

50×10

−8

2×5.0×10

−6

=20 m

⟹Length of wire, l=20 m

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