A ring of mean radius 15 cm has 3500 turns of wire wound on a ferromagnetic core of relative permeability 800. The magnetic field in the core for a ma

Question

A ring of mean radius 15 cm has 3500 turns of wire wound on a ferromagnetic core of relative permeability 800. The magnetic field in the core for a ma

A ring of mean radius 15 cm has 3500 turns of wire wound on a ferromagnetic core of relative permeability 800. The magnetic field in the core for a magnetising current of 1.2 A is
A. 2.48T
B. 3.48T
C. 4.48T
D. 5.48T

Monjur Alahi

4 views

2025-01-04 04:42

1 Answers

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Salim Ahmed Kawsar · Accepted Answer · 2023-02-05T15:29:48+06:00

Salim Ahmed Kawsar

Correct Answer - C
`"Here", r=15cm=15xx10^(-2)m`
`N=3500 "turns", I=1.2A, mu_(r)=800`

Then number of turns/length (n)
`(N)/(2pir)=(3500)/(2pixx15xx10^(-2))=4.48T`

4 views Answered 2023-02-05 15:29