Physics

Physics

Problem

For a long air-cored solenoid having

N

turns, length

L

and carrying current

I

, the magnetic field at its centre is a)

B=\dfrac{\mu_0NI}{2L}

b)

B=\mu_0\dfrac{IL}{N}

c)

B=\mu_0\dfrac{NI}{L}

d)

B=\mu_0\dfrac{N^{2} I}{L}

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