6.A very long ideal solenoid with a cross-section area A has N turns and a length l . Assume that ea
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6.A very long ideal solenoid with a cross-section area A has N turns and a length l . Assume that eachturn is circular. The self-inductance Ls of this ideal solenoid isNA (A)
(B)
(C)
(D)
, where ε0 is the electric constant and μ0 is the magnetic constant in a vacuum.