Answer Posted / subash nayak

choke is a high inductive device and does not allowed sudden
change of current , if it happens then a high voltage
induced as per the equation- V= L di/dt. Starter helps to
break the circuit as initially current flows , from supply
to choke,tube light one coil, starter, tube light other coil
then back to supply. when starter opens the circuit the
induced voltage across the tube light is sufficient to
ionise the fluorescent material inside the tube light and
the current path made through it. and tube light glows.

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