GENERAL KNOWLEDGE

Detailed explanation-1: -The first surviving Faraday apparatus, dating from 1822, demonstrates his work in magnetic rotation. Faraday used this mercury bath to transform electrical energy into mechanical energy, creating the first electric motor.

Detailed explanation-2: -In 1821 Faraday set about trying to understand the work of Ørsted and Ampère, devising his own experiment using a small mercury bath. This device, which transformed electrical energy into mechanical energy, was the first electric motor.