Question

What are the necessary items required to build an electric torch?

• A. A permanent magnet and a bulb
• B. A cell, wires, and a bulb
• C. A bulb and a switch only
• D. A coil, a bulb and a switch

Answer 1

The correct option is B

A cell, wires, and a bulb

From the given list, the basic requirements are wires, a bulb, cells (battery) and switch to build an electric torch. The permanent magnet and coil is not necessary here as we are not making any electromagnet. Basically, current flows from one terminal of the battery to the other through a metal wire and the bulb to complete the path of the current.