The current density in a cylindrical wire of radius 4 mm is 4 10^ 6 Am^ -2 . The current through the outer portion of the wire between radial distances R/2 and R is _____ A.

JEE Main 2022 Physics question

The current density in a cylindrical wire of radius 4 mm is . The current through the outer portion of the wire between radial distances R/2 and R is A.

Answer: 48

Solution

The area of the outer portion is . So the current is area = $4

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Question ID VK-034561