A field in which a test charge around any closed surface in static

a-field-in-which-a-test-charge-around-any-closed-surface-in-static

A field in which a test charge around any closed surface in static path is zero is called

A. Solenoidal

B. Rotational

C. Irrotational

D. Conservative

I had been asked this question in an interview for internship.

This intriguing question comes from Line Integral topic in portion Vector Calculus of Electromagnetic Theory

The correct choice is D. Conservative

To elaborate: Work done in moving a charge in a closed path is zero. It is expressed as, ∫ E.dl = 0. The field having this property is called conservative or lamellar field.