EasyAssistant Engineer (Electrical), Class-2, Road and Building Department2025✓ Editorially verified

PDF

Diamagnetic substances have relative permeability _____________.

⚑ Report issue

Found a wrong answer, translation, image or source problem? Send it to editorial review.

Answer & Explanation

Correct AnswerB. Less than 1

Quick Explanation

Diamagnetic substances have a small negative susceptibility, so μr = 1 + χm is slightly less than 1.

Formula / Key Relation

μᵣ = 1 + χm

For diamagnetic materials: χm < 0 ⇒ μᵣ < 1

Detailed Explanation

Concept & Reasoning

Magnetic susceptibility links magnetization to the applied magnetic field. Diamagnetic materials oppose the applied field weakly, giving χm < 0. Since μr = 1 + χm, their relative permeability falls slightly below unity. It is not zero, and it is not normally far below 1.

How to Solve It in the Exam

Negative susceptibility means relative permeability just below one.

Important Exam Point

Remember the three basic classes: diamagnetic <1, paramagnetic >1 slightly, ferromagnetic ≫1.

Related Revision Path

This question sits in the revision path Electromagnetic Fields → Magnetic Materials → Magnetic Properties .

Relative Permeability of Diamagnetic Materials explanatory diagram

Quick Trick

Negative susceptibility means relative permeability just below one.

Common Mistake

Do not interpret 'less than 1' as 'zero permeability'.

Exam Tip

Remember the three basic classes: diamagnetic 1 slightly, ferromagnetic ≫1.

SEO + Knowledge GraphRelated PYQs & Exam ContextExam path, knowledge path and deeper practice links.

Exam Path

Knowledge Path

Study concept · Relative Permeability of Diamagnetic Materials →Practice concept Practice topic

9Previous Exam Appearances

7All Related Questions

87Content Quality

Previous Exam Appearances

Assistant Engineer (Electrical), Class-2, Road and Building Department2025Q. 110