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How is the dislocation energy defined?

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How is the dislocation energy defined?

(a) J m^-1

(b) J m^-2

(c) m^-2

(d) N m^-1

I got this question in an interview for internship.

My doubt is from Crystal Defects topic in section Imperfection in Metal Crystals, Fracture, Corrosion and Oxidation of Engineering Material & Metallurgy

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Correct option is (a) J m^-1

Easy explanation: Dislocation energy is defined ad joule per meter and is denoted by E. Dislocation density is defined as meter per cubic meter or simply as per meter square.

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