The area of cross-section of copper wire is 3 \times 10^{-6} \m^2. It carries a current of 4.2 A. Calculate current density in the wire

Correct Answer is : 1.4×106A∕m2

SSE JE Electrical Engineering 10 Dec 2020 Papers

Question : 104 of 200

Marks: +1, -0

The area of cross-section of copper wire is

3 × 10^{-6} \m^2

. It carries a current of 4.2 A. Calculate current density in the wire

Solution:

Cross-sectional area (A)

= 3 × 10^{-6} \m^2

Current (i) = 4.2 A
Now current density in the wire can be calculated as

{\J}={{\i}}/{{\A}}

{\J}={4.2}/{3 ×10^{-6}}

∴{\J}= 1.4 × 10^{6} \A\/\m^2

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