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A magnetic core with an air gap has a permeability that can be considered infinite. It has a coil of wire wrapped around the
core. The following is known about the core:
A = 4(10-4) m² (Cross sectional area of the core)
N = 500 (turn in the coil)
1g = 2 mm
How much current is needed in the coil to create a force of 8 N closing the gap?
O 0.714 A
O 1.41 A
O 0.509 A
O 2.02 A

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