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15. A solenoid with a core of relative permeability μr has 300 turns, a length of 0.5 meters, and carries a current of 2 A. If the permeability of free space is μ₀, what is the magnetic field inside the solenoid?
(A) 600μ₁μ₀/0.5
(B) 300μ₁μ₀/0.5
(C) 600μ₁μ₀/2
(D) 0.5μ₁μ₀/600
(E) 0.5μ₁μ₀/300