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MHT CET Physics question

PhysicsMoving Charges and MagnetismMHT CET

The magnetic field () inside a long solenoid having turns per unit length and carrying current when iron core is kept in it is ( = permeability of vacuum, = magnetic susceptibility) [MHTCET 2015]

Answer: (D)

Solution

With a core, ; (a) has the wrong sign, (b)

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Question ID VK-080639