Electromagnetic Field Theory
Which statement does not say that electrostatic field is conservative?

 If the curl of E is identically zero.
 The potential difference between two points is zero.
 The work done in a closed path inside the fields is zero.
 If is gradient of a scalar potential.

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Electromagnetic Field Theory
Magnetostriction is a phenomenon of

 change in physical dimensions of ferromagnetic materials during magnetism.
 generation of electricity in ferromagnetic materials.
 generation of magnetism in electrical conductors.
 change in permeability of ferromagnetic materials during magnetism.

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