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JEE Main 2016 Physics question

PhysicsMoving Charges and MagnetismJEE Main 2016

Two identical wires A and B, each of length 'ℓ', carry the same current I. Wire A is bent into a circle of radius R and wire B is bent to form a square of side 'a'. If and are the values of magnetic field at the centres of the circle and square respectively, then the ratio is

Answer: (D)

Solution

: . : $ = 4 ×

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Question ID VK-008862