Calculating Strength of Electromagnets

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SUMMARY

This discussion focuses on calculating the strength of electromagnets, specifically using an iron core C-shaped electromagnet with dimensions of 15 cm in length and 1 cm² in cross-sectional area. The reluctance of the air gap is calculated as 1 cm divided by the product of 1 and 1 cm², resulting in a value of 100 henries per meter. The user clarifies that the reluctance is initially expressed in henries per centimeter, and confirms that multiplying by 100 converts it to henries per meter, aligning with the expected units.

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burnit
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Hi,

This is not homework, I'm just confused:

I have been asking on the electrical engineering forum about calculating the strength of electromagnets.

After some searching i have found the equations but i just can't quite get a handle on some of it?

They have an iron core C shaped electromagnet 15cm long & 1cm square in area.

They write: The reluctance of the air gap is 1 centimeter divided by 1 times 1 square centimeter.

The answer they have is 100 henries per meter.

How do they calculate this to get 100 as the answer?

Thanks
 
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I forgot to add that the air gap is 1cm & the permeability of air is 1 in this example.

Thanks
 
Ok, i'll have a go at it, the equation is:

(1 centimeter) / (1 * 1 (square centimeter)) = 100 m-1

I noticed that Reluctance is in Henries per Meter but the above calculation is in Centimeters so i assume the answers i have been getting are actually Henries per Centimeter, do i simply multiply the answer by 100 to change it to meters & then the answer is in Henries per meter & seem correct?.
 

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