Question

Magnetic compass is not made by arranging magnetic needle inside a soft iron case.Why?

Answer 1

The magnetic compass consists of a magnetized needle, or an array of needles, allowed to rotate in the horizontal plane. The superiority of present day magnetic compasses over ancient ones results from a better knowledge of the laws of magnetism which govern the behavior of the compass and from greater precision in design and construction.

Permanent magnetism cannot be obtained using a soft iron case.

• Errors due to eddy currents
• Cannot point the true north
• Quadrantral deviation
• Induced magnetism
• Asymmetrical arrangement
• Changing induction

Hence, the magnetic compass is not made by arranging magnetic needle inside a soft iron case.

Answer 2

Reason:

• Permanent magnetism cannot be obtained using a soft iron case.
• Errors due to eddy currents
• Cannot point the true north
• Quadrantral deviation
• Induced magnetism
• Asymmetrical arrangement
• Changing induction  

Hence, The magnetic compass is not made by arranging magnetic needle inside a soft iron case.

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