The relationship between uniform electric field intensity E and potential difference V across a separation d is
Correct answer: B. E equals V divided by d
- A. E equals V times d
- B. E equals V divided by d
- C. E equals d divided by V
- D. E equals V plus d
Explanation
For a uniform field, such as that between parallel plates, the intensity is the potential gradient, so a 100 V supply across plates 2 mm apart gives a field of 50,000 V per metre. This is why the unit volt per metre is equivalent to newton per coulomb. In a non uniform field the same relationship holds only as a local rate of change.
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About Electric Potential
Electric potential is the work done per unit positive charge in bringing it from infinity to a point, while potential difference compares energy change between two points. Work includes potential due to point charges, superposition of scalar potentials, equipotential surfaces, and the relation between electric field and potential.
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