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What is the formula of the dissipating surface of the coil?

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What is the formula of the dissipating surface of the coil?

(a) dissipating surface of the coil = 2*length of mean turns of the coil*(winding height * diameter of winding)

(b) dissipating surface of the coil = 2*length of mean turns of the coil*(winding height / diameter of winding)

(c) dissipating surface of the coil = 2*length of mean turns of the coil*(winding height + diameter of winding)

(d) dissipating surface of the coil = 2*length of mean turns of the coil/(winding height * diameter of winding)

I had been asked this question in exam.

This question is from Design of Field Winding in portion Design of Synchronous Machines of Design of Electrical Machines

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Correct option is (c) dissipating surface of the coil = 2*length of mean turns of the coil*(winding height + diameter of winding)

The explanation is: First the length of the mean turns of the coil is calculated. Then the winding height and the diameter of the winding is calculated to obtain the dissipating surface of the coil.

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