Current Electricity | Current Density

1.

If current density through a cylinderical wire of radius R is uniform j, then electric current through the wire is-

(A) jπR²

(B) 2jπR²

(C) jπR² / 2

(D) None of these

Option (A)

Option (B)

Option (C)

Option (D)

2.

Find current density across cuboid shaped conductor when electric current I flows across its length L.

I / LH

I / BH

I / BL

None of these

3.

In the wire shown, if current density in area A₁ is J, then find the current density in area A₂.

√2J

J/√2

2J

J/2