Answer (Detailed Solution Below)

Option 2 : A/m2
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The correct answer is option 2) i.e. A/m2

CONCEPT:

  • Current density is defined as the amount of electric charge flowing across a unit cross-sectional area in unit time.
    • It is a vector quantity.

The electric current density (J) for a given conducting material is given as:

\(J = \frac{q/t}{A} = \frac{I}{A}\)

Where q is the electric charge flowing, t is the time, I is the current flowing and A is the cross-sectional area.

EXPLANATION:

  • The SI units for current and area are A and m2 respectively.

Current density, \(J = \frac{I}{A}\) 

Thus, the SI unit of current density is A/m2.

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