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Why is the coil of a ballistic galvanometer wound on a non- metallic former?

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Why is the coil of a ballistic galvanometer wound on a non- metallic former?

(a) To minimise damping when high resistance is connected in series

(b) To maximise damping when high resistance is connected in series

(c) To minimise damping when high resistance is connected in parallel

(d) To maximise damping when high resistance is connected in parallel

I had been asked this question in an interview for job.

Query is from Determination of the B/H Characteristic in chapter Simple Magnetic Circuits of Basic Electrical Engineering

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The correct option is (a) To minimise damping when high resistance is connected in series

The explanation: The coil of ma ballistic galvanometer is wound on a nonmagnetic former in order to minimise damping when high resistance is connected in series.

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