Electric field intensity at a point is defined as
- 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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