Electricity: Magnetic and Heating Effects — Important Questions

They work only when current flows through them, They have north and south poles, Iron core makes them stronger

Electromagnets are temporary magnets that work only when current flows. Like permanent magnets, they have poles. An iron core increases their magnetic strength.

Increasing the number of turns in the coil, Using more cells (higher current), Adding an iron core

Electromagnet strength increases with more coil turns, higher current, and an iron core. Wire thickness doesn't directly affect magnetic strength.

The electrolyte is a thick paste, not liquid

Dry cells are called 'dry' because they use a paste-like electrolyte instead of liquid electrolyte, making them more convenient and portable.

Electric iron, Electric heater, Electric kettle, Hair dryer

Electric iron, heater, kettle, and hair dryer all use heating elements. Electric fan works on the magnetic effect (motor), not heating effect.