A substance whose relative permeability is less than the permeability of free space is _____________.
Answer & step-by-step solution
A diamagnetic material has permeability slightly below that of free space, equivalently relative permeability μr slightly less than 1. It develops a weak magnetization opposite to the applied field.
Concept & Reasoning
The wording compares material permeability with free-space permeability. Since μ = μ0 μr, a material with μ < μ0 has μr < 1 and is diamagnetic. Paramagnetic substances have μr slightly greater than 1, while ferromagnetic materials can have μr many times larger than 1. Diamagnetism is weak and generally associated with negative magnetic susceptibility.
How to Solve It in the Exam
μ below μ₀ ⇒ μr below 1 ⇒ diamagnetic.
Important Exam Point
Translate permeability wording into relative permeability before selecting the material class.
Quick Trick
μ below μ₀ ⇒ μr below 1 ⇒ diamagnetic.
Common Mistake
Relative permeability is dimensionless; compare μr with 1, not numerically with μ0.
वह पदार्थ जिसकी पारगम्यता मुक्त अंतरिक्ष की पारगम्यता से कम है, _____________ है।
उत्तर और चरणबद्ध हल
प्रतिचुंबकीय पदार्थ की पारगम्यता मुक्त अंतरिक्ष से थोड़ी कम होती है, अर्थात् μr 1 से थोड़ा कम। यह लागू क्षेत्र के विपरीत कमज़ोर चुंबकन विकसित करता है।
विस्तृत हल (मूल भाषा में)
Concept & Reasoning
The wording compares material permeability with free-space permeability. Since μ = μ0 μr, a material with μ < μ0 has μr < 1 and is diamagnetic. Paramagnetic substances have μr slightly greater than 1, while ferromagnetic materials can have μr many times larger than 1. Diamagnetism is weak and generally associated with negative magnetic susceptibility.
How to Solve It in the Exam
μ below μ₀ ⇒ μr below 1 ⇒ diamagnetic.
Important Exam Point
Translate permeability wording into relative permeability before selecting the material class.
Quick Trick
μ below μ₀ ⇒ μr below 1 ⇒ diamagnetic.
Common Mistake
Relative permeability is dimensionless; compare μr with 1, not numerically with μ0.
જે પદાર્થની પારગમ્યતા મુક્ત અવકાશની પારગમ્યતા કરતાં ઓછી હોય, તે _____________ છે.
જવાબ અને પગલાવાર ઉકેલ
પ્રતિચુંબકીય પદાર્થની પારગમ્યતા મુક્ત અવકાશ કરતાં થોડી ઓછી હોય છે, એટલે કે μr 1 કરતાં થોડું ઓછું. તે લાગુ ક્ષેત્રની વિરુદ્ધ નબળું ચુંબકન વિકસાવે છે.
વિગતવાર ઉકેલ (મૂળ ભાષામાં)
Concept & Reasoning
The wording compares material permeability with free-space permeability. Since μ = μ0 μr, a material with μ < μ0 has μr < 1 and is diamagnetic. Paramagnetic substances have μr slightly greater than 1, while ferromagnetic materials can have μr many times larger than 1. Diamagnetism is weak and generally associated with negative magnetic susceptibility.
How to Solve It in the Exam
μ below μ₀ ⇒ μr below 1 ⇒ diamagnetic.
Important Exam Point
Translate permeability wording into relative permeability before selecting the material class.
Quick Trick
μ below μ₀ ⇒ μr below 1 ⇒ diamagnetic.
Common Mistake
Relative permeability is dimensionless; compare μr with 1, not numerically with μ0.
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