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Physics, 24.04.2021 18:30 xeno777

A circular coil having 18 tums of wire and immersed in a medium of relative permeability of 135. If the coil has a radius of 33 cm and is in the plane of the paper. What current in unit of Xampere (A) must exist in the coil to produce a flux density of so mt at its center?
Correct Answer 10.81 please explain how

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