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Which of the following is the correct formula for calculating step resistance?

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Which of the following is the correct formula for calculating step resistance?

(a) γ = rn/rn-1

(b) γ = rn/rn+1

(c) γ = rn*rn-1

(d) γ = rn*rn+1

I have been asked this question during an online exam.

This key question is from Starting of DC Motors in division DC Motors of DC Machines

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Correct answer is (a) γ = rn/rn-1

To explain I would say: For given values of armature currents upper and lower, corresponding equivalent resistances are calculated. So, by the induction formula we calculate the value of γ and the step resistance as well, where n denotes the number of steps.

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