Question

Compass needle is placed in an aluminum or plastic case. Why do we not place it in an iron case?

• A. Iron gets easily corroded.
• B. Iron has magnetic nature
• C. Iron is the conductor of electricity
• D. Iron is expensive

Answer 1

The correct option is B Iron has magnetic nature

Magnetic compass is an instrument used to find the directions using the directional property of the magnetic needle. It becomes very important to avoid the presence of any other magnetic material around the magnetic needle since it can give wrong deflection due to the attractive property of the magnet. Therefore, the compass needle is placed in an aluminum or plastic case, but not in an iron case.