Question

iron ring of 100cm mean diameter and 10cm square cross section has 1000 turns of copper wire on it permeability of the material is 1500 then the reluctance of ring is

Answer 1

Explanation:

0.3Wbm-1397.9Aturnsm-1,0.2995Wbm-2

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Answer 2

2.5J

Explanation:

B = μ0 μr NI/l Wb/m2

∴ 1 = 4π × 10− 7 × 1000 × 400 I/0.2π

or I = 1.25 A  

Now,

L = μ0 μr AN2/l = 4π × 10− 7 × 103 × (100 × 10− 4) × (400)2 /0.2π = 32.

H E = 1/2(LI2) = 1/2 x 3.2 x 1.252 = 2.5J

Magnetic reluctance, often known as magnetic resistance, is a term used to describe the resistance of magnetic circuits. The ratio of magnetomotive force (mmf) to magnetic flux is what it's called. It is the opposition to magnetic flux and is determined by an object's geometry and composition.