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A ring of mean radius 15 cm has 3500 tur...

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

Text Solution

Verified by Experts

The correct Answer is:
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`
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