contestada

गुडिरहेको साइकलमा डाइनामोको मद्दतले बालिएको बत्ति साइकल रोकिंदा निभ्छ ।
कारण लेख्नुहोस् ।
Lamp is lit in the running bicycle by the help of a dynamo but it goes
off when bicycle is stopped. Give reason.