Question

A conductor of cross sectional area 0.2 square metre has resistance 5 Ω. If 4 A

current passes through it then calculate current density.
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Answer 1

Answer:

20 A/ sq metre

Explanation:

Given,

Area (A) = 0.2 sq metre

Resistance (R) = 5 Ohm ( not required)

Current (I) = 4A

we know current density (j) = I/A

=> j = 4A/0.2 sq metre

=> j = 20 A/sq metre (answer)