The current density in a cylindrical wire of radius r = 4.0 mm is 1.0 10^ 6 A/m^ 2 . The current through the outer portion of the wire between radial distances r/2 and r is x A; where x is _____

JEE Main 2022 Physics question

The current density in a cylindrical wire of radius r = 4.0 mm is . The current through the outer portion of the wire between radial distances r/2 and r is A; where x is

Answer: 12

Solution

The area of the outer portion is . So the current is area = $1.0

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Question ID VK-034471