Electricity And — Magnetism B Ghosh

He waited for dawn. He took a coil of wire—a hundred turns, carefully wound—and connected it to a sensitive galvanometer. Then, he thrust a bar magnet deep into the coil. Nothing. He held his breath. He yanked it out.

Neighbors came to see the "Ghosh Light." They asked, "What is the fuel? Where is the fire?" electricity and magnetism b ghosh

The needle leapt .