NEET-XII-Physics
32: Electric Current in Conductors
- #13A wire has a length of 2.0 m and a resistance of 5.0 Ω. Find the electric field existing inside the wire if it carries a current of 10 A.Ans : Given:
Length of the wire, l = 2 m
Resistance of the wire, R = 5 Ω
Current through the wire, i = 10 A
From Ohm's Law, the potential difference across the wire,
V = iR
∴ V= 10 × 5 = 50 V
Electric field,
`` \,\mathrm{\,E\,}=\frac{\,\mathrm{\,V\,}}{l}``
`` =\frac{50}{2}``
`` =25\,\mathrm{\,V\,}/\,\mathrm{\,m\,}``
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