Electric field intensity at a point is defined as
Correct answer: A. the force per unit positive charge placed at that point
- A. the force per unit positive charge placed at that point
- B. the work done in bringing a charge to that point
- C. the charge per unit area
- D. the potential at that point
Explanation
Field intensity is a vector measured in newtons per coulomb, equivalently volts per metre, and it points in the direction a positive test charge would be pushed. Work done per unit charge is potential, a scalar, and confusing the two is the most common error in this chapter. The test charge must be small enough not to disturb the field it is measuring.
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About Electric Field Intensity
Electric field intensity is the force acting per unit positive test charge, with direction set by the force on that charge. Work includes fields of point charges, vector superposition, field lines and the relation between field and electric potential. Field intensity must be distinguished from electric force and potential.
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