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Q.

A Rowland ring of mean radius 15 cm has 3500 turns of wire wound on a ferromagnetic core of relative permeability 800. What is the magnetic field ‘B’ in core for a magnetizing current of 1.2A.

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a

4.48 T

b

6.54 T

c

1.56T

d

0.57T

answer is A.

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Detailed Solution

$B = \frac{μNi}{2 πR} = \frac{μ_{0} μ_{r} Ni}{2 πR}$

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