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Assertion (A): Plastic deformation in metals and alloys is a permanent deformation under load. This property is useful in obtaining products by cold rolling.
Reason (R): Plastic or permanent deformation in metal or alloy is caused by movement or dislocations. 
  • a)
    Both A and R are true and R is the correct explanation of A
  • b)
     Both A and R arc true but R is NOT the correct explanation of A
  • c)
    A is true hut R is false
  • d)
    A is false but R is true
Correct answer is option 'C'. Can you explain this answer?
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Assertion (A): Plastic deformation in metals and alloys is a permanent...
Plastic Deformation in Metals and Alloys

Assertion (A): Plastic deformation in metals and alloys is a permanent deformation under load. This property is useful in obtaining products by cold rolling.

Reason (R): Plastic or permanent deformation in metal or alloy is caused by movement or dislocations.

Explanation:

Plastic deformation is a permanent deformation that occurs in metals and alloys when a load is applied. This property is useful in obtaining products by cold rolling, as it allows for the material to be shaped and formed into different shapes and sizes.

The reason for plastic deformation is the movement or dislocations of atoms within the metal or alloy. When a load is applied, the atoms within the material move and slide over one another, causing the material to deform. This deformation is permanent, as the atoms are now in a new position and cannot return to their original location.

Therefore, both Assertion (A) and Reason (R) are true. However, Reason (R) is not the correct explanation of Assertion (A). While the movement or dislocations of atoms within the metal or alloy are the cause of plastic deformation, it does not fully explain why the deformation is permanent.

Hence, the correct answer is option 'C'.
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Assertion (A): Plastic deformation in metals and alloys is a permanent deformation under load. This property is useful in obtaining products by cold rolling.Reason (R): Plastic or permanent deformation in metal or alloy is caused by movement or dislocations.a)Both A and R are true and R is the correct explanation of Ab)Both A and R arc true but R is NOT the correct explanation of Ac)A is true hut R is falsed)A is false but R is trueCorrect answer is option 'C'. Can you explain this answer?
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