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What is the effect on time constant of transient current, as a result of resistance commutation?

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What is the effect on time constant of transient current, as a result of resistance commutation?

(a) Remains same

(b) Decreases

(c) Increases

(d) Increases then decreases

I got this question in my homework.

My question is based upon Commutation Process -1 in division Commutation Process & Excitation Methods of DC Machines

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Correct choice is (d) Increases then decreases

The explanation is: We add high contact resistance between commutator segments and brushes thus, it adds resistance to the circuit of the commutating coil thereby reducing the time constant (L/R) of the current transient (ic(t)), helping it to change faster in the desired direction.

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