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What is the formula for the area of the poles shrank of the laminated poles?

What is the formula for the area of the poles shrank of the laminated poles? Correct Answer area of the pole shrank = flux in the pole body * magnetic field

For finding out the area of the pole shrank first the flux in the pole body is found out using the product of the leakage coefficient and the useful flux in the pole. Next, the magnetic field is measured and the product gives the area.

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Question : What will be the total weight of 10 poles, each of the same weight ?

Statements :
I. One-fourth of the weight of each pole is 5 kg.
II. The total weight of three poles is 20 kilograms more than the total weight of two poles.
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