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NEET 2002 Physics question

PhysicsMoving Charges and MagnetismNEET 2002

The magnetic field of given length of wire for single turn coil at its centre is 'B' then its value for two turns coil for the same wire is :

Answer: (3)

Solution

Let the wire have length . Single turn: , and . Two turns of the same wire: , so . The field at the centre of turns is $B'

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Question ID VK-088979