Physics Electrostatics ETEA 2015
PMDC Verified Question 120 of 131
Q.88 The unit of the electric field is:
A
N/C
B
V/m
C
J/C.m
D
All of the above
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: All of the above
1. Concept:

The electric field can be defined mechanically (force per charge) or electrically (potential gradient), leading to equivalent, interchangeable SI units.

2. Formula:

$$ E = \frac{F}{q} \quad \text{and} \quad E = \frac{V}{d} $$

3. Solution:

  • From \( E = F/q \), the unit is Newtons per Coulomb (N/C).


  • From \( E = V/d \), the unit is Volts per meter (V/m).


  • Since 1 Volt = 1 Joule / 1 Coulomb (J/C), substituting this into V/m yields J / (C·m).


  • Therefore, all three expressions represent valid units for the electric field.


4. Why other options are incorrect:

Selecting only A, B, or C would be incomplete because all three are physically and dimensionally identical.

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