For a toroid with N total turns, mean radius r, carrying current I, the magnetic field inside is:
Aμ0 N I²
Bμ0 N I /r
Cμ0 I / N
Dμ0 N I / (2πr)
Answer & Solution
Correct answer: D. μ0 N I / (2πr)
B = μ0 N I/(2πr) inside a toroid.
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